July 26, 2015
How to make an alcohol stove using soda cans.
July 18, 2015
Planetary Resources' A3R spacecraft deployed from the International Space Station.
July 12, 2015
Added Hero's steam engine video - making it and showing it in action.
July 2, 2015
Very easy to make steam engine - Hero's steam engine.
June 27, 2015
New video on how I made the laser communicator.
June 21, 2015
DIY/homemade laser communicator.
June 12, 2015
New DIY/homemade capacitor for my small spark gap Tesla coil.
June 6, 2015
How to transmit sound using sunlight - the photophone.
May 30, 2015
Added a photo and video of powering a TEA laser using a Wimshurst machine.
May 22, 2015
New spiral primary coil for my small spark gap Tesla coil.
May 16, 2015
Detailed video on how to make my small spark gap Tesla coil.
May 3, 2015
Blue Origin successfully launches their New Shepard spacecraft to the edge of space.
April 14, 2015
By popular request... a small spark gap Tesla coil.
April 8, 2015
Ad Astra gets funding for next generation VASIMR 100 hour ion propulsion rocket.
April 6, 2015
Piezoelectric electrostatic generator made from a BBQ ignitor.
March 30, 2015
Extracting chlorophyll from spinach and fluorescing it with sunlight and my TEA laser.
March 23, 2015
Recent space news from Mars One, Google Lunar X Prize and Astrobotic Technology.
March 15, 2015
Fun with an Arduino and a speech synthesizer.
March 14, 2015
Added fuses and meters to the electronics symbols for schematics page.
March 11, 2015
Added a schematic and more details to the DIY 24 volt power supply page.
March 5, 2015
Powering a Compact Fluorescent Light (CFL) using an electric fly swatter.
February 27, 2015
Updated solar shade finding iPhone and Android apps.
February 20, 2015
Using an electric fly swatter as a high voltage source.
February 11, 2015
Details about making a Stirling engine's displacer using steel wool.
February 6, 2015
How-to-Make video for wireless transmission of electricity and a calculation spreadsheet.
January 30, 2015
Massively updated explanation of solar panel specifications (maximum power current, voltage, ...).
January 26, 2015
Made a video explaining how the triboelectric effect works.
January 22, 2015
New page about the triboelectric effect and with the triboelectric series table.
January 1, 2015
Added a transistor protection section to the 30kV high voltage power supply page.
December 21, 2014
Fun with DIY wireless transmission of electricity.
December 13, 2014
Added a test for the effect on water conductivity on the Kelvin water dropper.
December 7, 2014
How to make a pinhole camera for viewing the sun or just having fun.
November 29, 2014
Recent news from SpaceX, Bigelow Aerospace, Planetary Resources and NASA.
November 22, 2014
Measuring solar panel's open circuit voltage and short circuit current.
November 15, 2014
How to make the Arduino controlled skull, includes the source code.
November 8, 2014
ScareDuino, my shoulder mounted, Arduino controlled skull.
November 1, 2014
Enhanced section on how to get a lifter/ionocraft to fly.
October 25, 2014
Added the Copenhagen solar cooker to the solar cooker comparison page.
October 17, 2014
Making holograms with plastic pyramid - includes Princess Leia and a flying pterodactyl.
October 12, 2014
How I made a simple solar panel for use in a video.
October 11, 2014
Domestic content requirements have been removed from the Ontario microFIT program.
September 28, 2014
Joule thief circuit powering a clock instead of the usual LED or CFL.
September 17, 2014
SpaceX and Boeing win the contracts from NASA to carry crew to and from the ISS.
September 7, 2014
Added a diagram and an improved explanation for solar noon to
the page on finding true south.
August 29, 2014
Many more details added about the gravity light version 2.
August 22, 2014
New gravity light version 2 that runs for longer and gives more light.
August 9, 2014
New video showing how the corona motor (v2) was made.
August 3, 2014
New main corona motor page with explanation of how it works and a more powerful motor.
July 21, 2014
More symbols added to the electronic symbols for schematics page.
July 14, 2014
Tips about Fresnel lens and box solar cookers.
July 4, 2014
New page on electronic symbols, plus a video on how to read a schematic.
June 28, 2014
New video showing step-by-step how I made the nitinol wire/shape memory alloy inchworm.
June 22, 2014
Made a nitinol wire/shape memory alloy inchworm that walks!
June 15, 2014
Huge update to turning a PC monitor into a high voltage power supply.
June 8, 2014
Experimenting with nitinol wire (shape memory alloy).
June 1, 2014
Added details and example about solar panel specifications.
May 19, 2014
Lots more details added to the multiplier section of the how-to-make 30kV power supply page.
May 17, 2014 Video on how to read music and to adapt it to the
555 timer music player and the
May 12, 2014
New high voltage power supply with easier to find parts.
April 28, 2014
Added Q&A about batteries and motors to the Van de Graaff generator FAQ page.
April 19, 2014
Enhanced the gravity light to power 3 LEDs and run for 8 minutes - video included
April 14, 2014
Gravity light (homemade) that powers an LED using a slowly falling mass
April 6, 2014
Making music instruments with drinking straws - a trombone and a trumpet
March 29, 2014
New calculator for figuring out how many solar panels you need.
March 23, 2014
Moving things with sound - Helmholtz resonators
March 18, 2014
Much improved voltage drop calculator for solar power system wiring.
March 10, 2014
Cleaning up smoke with a DIY electrostatic/smoke precipitator!
March 2, 2014
Added Van de Graaff generator FAQ (Frequently Asked Questions) page.
February 13, 2014
Added laser diodes to Star Wars TIE Fighter and Star Trek Enterprise models.
February 9, 2014
The mysterious ball bearing motor - how to make one and how it works.
February 2, 2014
Video about fixing my 30kV high voltage power supply.
January 25, 2014
Added an easy to use voltage drop calculator for solar power system wiring.
January 19, 2014
Repaired piano/keyboard key - encouraging repairing instead of throwing away.
January 13, 2014
Make a simple corona motor (or electrostatic/atmospheric motor)
January 3, 2014
Astrobotic plans to visit lunar skylight in October 2015.
December 14, 2013
New 2025 Mars crew landing date, Lockheed-Martin and SSTL selected for 2018 mission studies.
December 8, 2013
Added ion propulsion to a Star Trek Enterprise model!
November 30, 2013
Two new ion propulsion videos added, including one with a Star Trek Enterprise model!
November 20, 2013
How I did the linkage for my big Stirling engine.
November 17, 2013
About the thermoelectric effect (Peltier and Seebeck effects), and making ice.
November 5, 2013
Where to get a power supply for your lifter/ionocraft (an often asked question.)
November 1, 2013
Peltier module cooling efficiency testing.
October 30, 2013
Added details on the Google Lunar X Prize.
October 16, 2013
An easy to make laser - TEA laser.
September 30, 2013
Updated with the latest microFIT pricing and solar panel costs.
September 21, 2013
New how-to-make high voltage power supply video plus more added.
September 6, 2013
Awesome new music player I made for the 2013 Ottawa Mini-Maker Faire.
August 18, 2013
How to make your own electrolytic capacitors.
August 10, 2013
Make a simple AM radio transmitter.
August 3, 2013
DIY amplifier for playing the crystal radio on a loud speaker.
July 21, 2013
New Stirling engine for outdoor use with concentrated solar from Fresnel lens.
June 29, 2013
How to power a Compact Fluorescent Light (CFL) using a joule thief circuit and AA batteries!
June 22, 2013
Many more "how it's made" details added for the 555 timer chip music player.
June 2, 2013
Concentrated solar power experiments with large fresnel lens, solar cell and cooling.
May 26, 2013
Franklin's bell science project - how to make it.
May 17, 2013
How to make musical instruments using a 555 timer chip circuit, a pencil and paper.
May 5, 2013
How to make a diode using a razor blade and a pencil for use with a crystal radio.
April 28, 2013
Updates to path-to-space page and added the Mars One settlement plans.
April 23, 2013
New section - Science and Electronics Projects!
March 25, 2013
Major updates to electret making, including new positive test results and
video detailing how to determine charge polarity using an electroscope.
March 11, 2013
Updated the calculation for a microFIT system given lower solar panel costs.
March 8, 2013
A portable crystal radio using a loop antenna coil!
February 12, 2013
Step-by-step video on how to make a Kelvin water dropper, including troubleshooting.
February 2, 2013
Make static electricity from falling water - the Kelvin water dropper.
January 21, 2013
Bigelow to supply inflatable module to NASA for Internationl Space Station.
December 26, 2012
How to use earbuds/iPhone earpods with a crystal radio.
December 10, 2012
Large, enclosed solar panel made of transistor solar cells.
December 2, 2012
New page all about crystal earpieces for crystal radios, including homemade.
November 17, 2012
Tips for weatherproofing transistor solar panel.
November 12, 2012
How to check for piezoelectric speakers in gift cards without damaging them.
October 20, 2012
New Part 2 How to Make a Van de Graaff Generator video with lots of tips and improvements.
October 13, 2012
Van de Graaff generator as Faraday cage experiment.
October 7, 2012
New how to make a Stirling engine and how it works video and some tips.
September 15, 2012
How to make a piezoelectric crystal speaker from scratch.
August 30, 2012
New How a Crystal Radio Works video (very detailed).
August 11, 2012
Mini solar tower (version 7) with a tower this time!
August 5, 2012
Details of and my experience with the commercially available, and
excellent, Copenhagen solar cooker.
July 27, 2012
How to repair a solar panel whose glass has been shattered.
July 20, 2012
By request, added a crystal radio amplifier step-by-step how-to-make video.
July 16, 2012
Ontario solar Feed-in Tariff program Version 2.0 rules finalized and accepting applications.
July 13, 2012
Finally, a fresnel lens powered "solar tower" turning a paper turbine.
July 6, 2012
New - How a Joule Thief Works video!
June 29, 2012
How to get a piezoelectric igniter from a lighter and how it works.
June 25, 2012
Repaired camera tripod leg - encouraging repairing instead of throwing away.
June 22, 2012
Updated Copenhagen solar cooker - more construction, aiming and
adjusting, videos, ...
June 18, 2012
Copenhagen solar cooker - A good solar cooker that's easy to
make or inexpensive to buy.
June 15, 2012
New video - Day in the Life of an Off-Grid Solar Installer.
June 13, 2012
DIY solar pool heating system in Sardinia, Italy.
June 8, 2012
The joule thief - getting power from dead batteries.
June 4, 2012
A comparison of different solar cookers.
June 1, 2012
A simple amplifier for my crystal radio - includes a how-to-make video.
May 28, 2012
Added air changes per hour setting to solar house simulator and analysis at bottom.
May 25, 2012
SpaceX's Dragon spacecraft successfully berthed at the International Space Station.
May 22, 2012
Solar city Ottawa - a sample of the many different types of systems in our northern city.
May 17, 2012
Determining charge using an electroscope and electrostatics and magnetism video.
May 14, 2012
Rain water harvesting for flushing toilets and
Added mention to raise evacuated tubes off roof for snow accumulation.
May 11, 2012
Bigelow to use SpaceX for getting to/from their space station.
May 7, 2012
Tricks for aiming things (solar cookers, PV panels, solar air heaters, ...) at the sun.
May 5, 2012
Selected commercial solar cookers - ones you can buy.
April 30, 2012
Taught my first solar cooking class - course handout, tips and photos are here.
April 27, 2012
Planetary Resources to start prospecting near Earth asteroids by or in 2014.
April 23, 2012
Detailed introduction to solar cooking.
April 20, 2012
Beefed up the section on Van de Graaff generator belts.
April 16, 2012
Mobile full off-grid solar power system on a trailer.
April 13, 2012
SpaceX's first launch to the International Space Station is set for April 30th.
April 9, 2012
Art's hybrid solar oven that can brew percolating coffee and also fry and bake.
April 6, 2012
Solar panel made of transistor solar cells powering a calculator.
April 5, 2012
News - Astrobotic announces Polaris mission to moon's north pole.
April 2, 2012
The fun with crystal radios that I've had over the years - including my how-to-make video.
March 30, 2012
How to make a solar cell using a power transistor.
March 26, 2012
Sizing and selecting batteries for an off-grid solar power system.
March 23, 2012
Significantly lowered prices for Ontario solar Feed-in Tariff program and
a new high voltage probe video, including taking it apart.
March 20, 2012
Neat tool made by Guy for cutting solar air heater cans.
March 19, 2012
Working out your power needs for an off-grid solar power system.
March 16, 2012
New voltage, current, airflow video for a lifter plus more enhancements to these pages.
March 12, 2012
A more detailed off-grid solar power system diagram and
March 9, 2012
New step-by-step construction video for a lifter (non-conventional propulsion).
March 5, 2012
Started a section dedicated to off-grid solar power.
March 3, 2012
Improved the heat transfer/loss calculator,
added Suntuf and twin wall glazing to the insulation table, and
info about U-value and conversion to R-value.
February 27, 2012
All about heat transfer, loss and gain, examples, and a calculator.
February 24, 2012
Video of modified CooKit solar cooker contruction and use in below freezing weather.
February 21, 2012
Diagrams and more tips added to making a computer monitor high voltage power supply and
added an explanation of why piezo crystals show positive and negative spikes.
February 20, 2012
Solar cooked in below freezing weather: soya rice vegetable concoction and
the modified CooKit solar cooker that was used.
February 13, 2012
Finished the off-grid solar system battery mainentance pages and
SpaceX to visit the International Space Station in late April.
February 11, 2012
My improved How a Van de Graaff Generator Works video - with all the physics.
February 6, 2012
How to measure a solar system's battery bank voltage.
January 30, 2012
Details about amp hour meters for solar power systems.
January 23, 2012
Solar cooked gluten-free pumpkin sourdough bread/cake recipe.
January 19 2012
Made a step-by-step video of getting a piezoelectric crystal from a BBQ ignitor.
January 17 2012
How to use a hydrometer to measure the specific gravity of solar system batteries.
January 16 2012
Winter results for David's DIY PEX coil solar water heater.
January 10 2012
A warning about window covering solar air heaters.
January 9 2012
Inexpensive iPhone and Android apps for doing solar shade analysis.
January 6, 2012
My fancy DIY shade finder tool for doing solar site surveys and
how to read a Sun Chart.
December 19, 2011
New solar cooker - the Modified CooKit solar cooker!
December 14, 2011
Solar cooked winter solstice sourdough sunshine cake recipe and
reflector aiming method using distant viewing trick.
December 12, 2011
New solar cooking recipe section, starting with no-knead bread and pizza crust.
December 7, 2011
Baffle solar air heaters for odd shapes and
multiscreen screen solar air heaters.
December 2, 2011
New video for the simple DIY tool for finding year round shading.
November 27, 2011
Blog entry - The vanishing garbage and
November 25, 2011
Step-by-step how to make a Rochelle salt piezoelectric crystal and
a new video on testing Rochelle salt piezoelectric crystals.
November 22, 2011
Blue Origin reveals some of its orbital space plans and so
Origin to the Path to Space.
November 18, 2011
New page about my Cansolair installation and
a video detailing parts of the owner-installed Enerworks solar thermal/hot water system.
November 11, 2011
Finding sun shading/obstacle issues and
a simple DIY tool for finding year round shading.
November 4, 2011
Detailed video tour of the owner-installed Enerworks solar thermal/hot water system.
November 1, 2011
An owner-installed Enerworks solar thermal/hot water system.
October 27, 2011
JP Aerospace flies Tandem airship to record height to the edge of space.
October 24, 2011
Nuclear fusion including quantum tunnelling - and a new video.
October 20, 2011
Solar air heater with selectable input and output paths.
October 17, 2011
New detailed solar off-grid home video tour - a large system.
October 11, 2011
Started an insulation table for solar/renewable energy DIYers.
October 5, 2011
Passive solar house (well... box) simulator stable version uploaded.
October 3, 2011
Introduction to insulation: convection, conduction, radiation, R-values.
September 29, 2011
SpaceX reveals how they'll make their Falcon 9 rocket reusable.
September 24, 2011
Getting started page added to help newcomers to renewable energy projects.
September 14, 2011
How to repair things... starting with a knapsack and a bicycle lock key.
September 5, 2011
Various methods for finding true south for aligning solar collectors.
August 26, 2011
Video explaining nuclear fusion in the sun and how it gives us solar energy.
August 25, 2011
Data logs added for Guy's DIY can solar air heater.
August 23, 2011
Updated absorber and glazing subsections on main solar air heater page and
added schematic to homemade 24 volt power supply page.
August 16, 2011
Guy's DIY can solar air heater with measured savings for two seasons and
using an hour meter to measure runtime for solar heating systems.
August 12, 2011
Very efficient/interesting commercial solar air heater, Lubi.
August 10, 2011
First success with a car sunshade solar cooker!
August 8, 2011
August space news - Atlas V rocket selected for Boeing's Crew Space
August 4, 2011
Unique DIY solar hot water system using a PEX spiral coil/solar oven collector.
July 28, 2011
How to design reflectors for solar cookers (and other things.)
July 27, 2011
July space news - SpaceX's Dragon scheduled for December docking with ISS and
Bigelow moving directly to BA 330 (330 cubic meter) inflatable habitat development.
July 22, 2011
Full details on how I designed my fresnel lens and mirror solar cooker.
July 14, 2011
Fresnel lens AND MIRROR solar cooker; cooking from below and without goggles!
July 12, 2011
Where not to put a chlorinator in a solar pool heating system.
July 11, 2011
Mini solar tower version 5 partially rotates a small paper turbine.
July 5, 2011
Mini solar tower version 4 now up to 165C (330F) plus.
Also added Don's prototype
fresnel lens solar cooker.
July 3, 2011
Blog entry - The world in 2050
June 25, 2011
Mini solar tower for generating electricity using fresnel lens.
June 18, 2011
About sunlight capture areas for solar cookers as a start to a
new section on designing solar cookers.
June 17, 2011
All about fresnel lenses - or what I learned making my solar cooker!
June 13, 2011
Blog entry - Doers ruin predictions
June 10, 2011
Fried an egg for lunch with my fresnel lens solar cooker!
June 7, 2011
How to make a Van de Graaff generator.
June 5, 2011
Bruce's feature rich fresnel lens solar cooker.
June 1, 2011
My new fresnel lens solar cooker!
May 27, 2011
DIY solar air heater types and
miscellaneous additions to the main solar air heater page.
May 26, 2011
Rain water powered piezoelectric generator lighting an LED!
May 22, 2011
Derelict rear projection TV = two new solar cookers!
May 20, 2011
Extracting and testing piezoelectric disks from gift cards.
May 15, 2011
Blog entry - Redefining normal
May 11, 2011
Firsts and mishaps in solar cooking - started a solar cooking log.
May 6, 2011
Complete video of the design, construction and use of my cone solar cooker.
May 5, 2011
How to mount a transistor to a heatsink.
April 29, 2011
News about SpaceX's $75 million award from NASA for launch escape
system... and planetary lander and
minor updates to the "path to space" since things keep happening.
April 28, 2011
Details of AccuCut machine used for making electric rocket.
April 25, 2011
Sizing steps added for DIY solar pool heating hose/tube length.
April 21, 2011
Blog entry - Would you live without a washing machine?
April 16, 2011
Started solar cooking! Nothing beats solar cooked rice from
a homemade solar cooker.
April 11, 2011
How to make a sun finder for pointing a solar cooker at the sun.
April 6, 2011
More shower on/off valve water use tests, foot pedal activation idea, ...
April 5, 2011
SpaceX's Falcon Heavy added to the 'path to space' page as a result of recent announcements and
added news item re the Falcon Heavy to main space page.
April 4, 2011
2 gallons/7.6 litres for a full shower?! Yup. See the table of times and calculations.
April 1, 2011
How to size a DIY or commercial solar pool heating system.
March 31, 2011
Vaccum energy tapping design page now has general idea at top.
March 29, 2011
Ran across a great Ontario microFIT (PV feeding the grid) video.
March 25, 2011
The Airship to Orbit program - a novel way to go from Earth to space.
March 18, 2011
How to use a watt meter to save electricity!
February 18, 2011
Save water and heating costs by using a low flow shower head!
February 11, 2011
Much added to the 'path to space' page as a result of recent announcements and
added news item re Astrobotic Technology's moon plans.
February 7, 2011
More ways to clear snow off solar panels (plus added diagrams.)
February 4, 2011
Solar snow pre-melter experiments.
February 2, 2011
New Ontario Commercial Feed-in-Tariff (CFIT) program for
renting of roofs/property for solar systems.
January 25, 2011
Assisting in melting snow off solar panels with strips of black tape and
a new main winter solar issues page.
January 20, 2011
Added a main 'Space' page.
January 19, 2011
Worm bin temperature measurements in mid-winter.
January 18, 2011
Realistic analysis of the future of humans in space.
January 17, 2011
Made a very full video about heat retention cooking.
January 10, 2011
More info on just about everything to do with DIY solar air heaters and
added types and CSA Performance Factors for commercial solar air heaters.
December 22, 2010
New main efficiency and conservation page and
how to do heat-retention cooking - cook long grain brown rice with 10
minutes on the stove instead of 45!
December 16, 2010
New main composting page and
started doing green bin composting for the winter.
December 9, 2010
Blog entry - Can 100 miles of mirrors concentrated solar thermal power the US?
December 3, 2010
Ideas added for DIY dry cuprous oxide solar cells.
December 2, 2010
Revised how the vacuum energy tapping theory calculates space energy density.
December 1, 2010
Ontario microFIT/FIT Feed-in Tariff program details (up to $0.802/kWh).
(Updated Dec 13 - See News)
November 18, 2010
How to square a frame for a solar array.
November 15, 2010
Barium titanate doorknob capacitor propulsion experiment!
November 12, 2010
Much improved Part 2 video for solar air heater temperature control and
new assembly photos.
November 7, 2010
Abundant detail, circuits and videos on temperature control for solar air heaters!
October 4, 2010
In the testatika, the electric field is through the horseshoe magnet
itself and not the gap between the legs.
September 10, 2010
New very detailed report of the DIY spiral hose type of solar pool
heater in Tuscany!
Also, now introducing RSS support for rimstar.org! Click the button above.
August 26, 2010
Ontario's microFIT program now paying $0.642/kWh for non-roof systems.
August 15, 2010
DIY spiral hose type solar pool heater in Tuscany!
August 14, 2010
More details about solar pool heating control and automation.
July 15, 2010
New high voltage, infinitely adjustable horizontal rotating test platform.
June 24, 2010
Diagrams and ideas for the testatika principle experiment.
June 14, 2010
Visitor report, "Testatika demonstration with over 30 engineers".
June 12, 2010
Better mixing technique for Barium Titanate capacitors: K=27!.
May 15, 2010
Demonstration of charge holding in vacuum energy capacitor (work-in-progress).
May 7, 2010
More details on Ontario's $0.802/kWh Feed-in Tariff program and
spreadsheet calcs show lower voltage needed for vacuum energy tapping and
convincing evidence of mesh at center of 3kW testatika machine.
April 21, 2010
Making Barium Titanate capacitors for a high dielectric constant.
April 16, 2010
Much more likely explanation for what the testatika 3kW machine's sectors consist of.
March 21, 2010
Calculated required voltage for particle creation from vacuum energy and
a new design idea from how this might be going on in the testatika.
March 16, 2010
Last part of off-grid cottage size/type system on a motor home added.
March 9, 2010
Added AC and battery wiring to off-grid cottage size/type system on a motor home.
March 5, 2010
Derived surprisingly good formula for vacuum energy tapping theory calculations.
March 2, 2010
Added solar panel wiring, including to charge controller and battery
February 27, 2010
Very, very detailed desciption of installation of off-grid cottage
size/type system on a motor home.
February 23, 2010
First vacuum energy tapping theory calculations.
February 16, 2010
New video about inductive charging using an electroscope and
major updates to vacuum energy theory.
February 8, 2010
First vacuum energy tapping theory experiments.
February 3, 2010
Fuller explanation of the vacuum energy tapping theory.
February 1, 2010
Vacuum energy tapping theory and designs (experiments in progress.)
January 12, 2010
Feed-in Tariff program replaces Standard Offer Program in Ontario for
solar power and
added Matrix Energy's products to solar air heater manufacturer info.
December 16, 2009
High voltage power supply with positive, negative and ground AT THE SAME TIME!
December 14, 2009
High voltage NEGATIVE voltage multiplier.
November 27, 2009
Major updates to solar air heater manufacturer info!
November 14, 2009
A new 312,000 PV solar panel solar farm in Ottawa, Ontario, Canada!
November 6, 2009
Testatika HV pulsing of magnets and converting to low voltage DC!
October 10, 2009
Added a video of how I harvest my worm castings (poop)!
October 6, 2009
My tricks for doing container gardening in our parking lot.
September 5, 2009
New food section, my growing efforts starting with... broccoli!
September 2, 2009
Some recent testatika work with 276mm disk and insulated HV plates.
What's New archive...
- Share your project on rimstar.org -
Watch my how-to video, How to how to make an electroscope (DIY) on WonderHowTo.