The greatest need modern civilizations have is energy. Learn about oil, electricity and newer forms of energy like solar and wind power.
On the Flintstones, a small bird sits inside the light and turns it on every night before he goes to bed. In a modern streetlight, a small circuit replaces the bird.
You've probably never noticed how many of these you use everyday, but HowStuffWorks took the time to count them and take them apart to see what's inside!
By Marshall Brain
Electrical power is a little bit like the air you breathe: You don't really think about it until it is missing. There are good reasons the power grid distribution system works the way it does, though it can lead to some big problems.
By Marshall Brain & Dave Roos
You've probably seen solar cells on calculators, call boxes, road signs, homes and businesses. But how do solar cells work?
By Jessika Toothman & Scott Aldous
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