Well, I thought of building a solar concentrator out of cds, but it ended up being just a … “reflector”. It could work by having something painted in black and placed in the center of this thing, but I’ll try to build a concentrator some time. Here are the pictures: Actually, just before sunset, a […]Read more "DIY CD Solar Concentrator -attempt"
There is a show on youtube that I subscribed to. Some teens from France make all kinds of inventions and innovations in their show called “Incroyables Expériences”. Their last entry (from 5th August) impressed me, they created something really useful: a handheld generator that produces 220v using a dynamo, excellent for emergency situations. You might […]Read more "Handheld 220 Dynamo Generator"
Guns- you see them at TV, and even live or you may have one yourself. But guns using bullets are so old-fashioned now… How about a potato gun? Or potato cannon, in this case… I found a video recently from MakeMagazine (with the famous kipkay presenting the show) about making a potato cannon. The principle […]Read more "1..2..3.. Potato Launch!"