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Turn any magazine into a flashlight with this optical illusion
These two red dots are actually identical. Here’s how
Here’s why your brain is so bad at those ‘spot the difference’ games
How a zebra’s stripes put bloodthirsty flies into a tailspin
What it really takes to power your home for a day
What is a horsepower?
Robert Afzal is developing powerful laser blasters for the U.S. military
In photos: updating New York’s vast and fragile telecom backbone
Hackers are attacking the electric grid
Get off the couch and under a barbell with this weightlifting starter kit