Flashlight-impromptu can be made from storage battery and a bright led. The battery is installed between the findings of the led, observing polarity, and fasten a large sandbox or plastic a paperclip. The latter is covered by a layer of plastic, does not conduct current, so the short circuit using a paperclip is not going to happen.
Recommend to read
MOTOR ASSISTANT: AND WILL PLOW, AND FILM, AND GIVE YOU A DRIVE
This walk-behind tractor was not created for an exhibition - for work. In the garden, on a personal yard. In order to plow the plot, and spray the trees, and cut firewood, and transport...
Six-wheeled all-terrain vehicle with onboard turning principle
Once upon a time, the Earth was inhabited by dinosaurs, brontosaurs and many other strange animals that did not need paths or roads - they made them for themselves. And at the All-Terrain...
