Maybe you won your office pool. Maybe a bank erred in your favor. Maybe you got a refund on your tax return. What are you going to do with that money? You could put it all in your savings account. Or, ...

There are hundreds of LEGO sets out there, but any LEGO fan – even a dedicated one – will build a miniscule fraction of them. Display space is one reason. Price is another. And for the amount of money ...

The Joule Thief Circuit is a simple and clever electronic design that can power an LED using a nearly dead battery.