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The Physics of Time Travel
Scientists tell us it's technically possible. Here's a how-to guide for the ambitious tinkerer.
Time Travel Made (Relatively) Easy
If we wish to travel through time, we must be able to control it, to mold it to our own desires and specifications...
Let’s Do the Time Warp Again
The science and the fiction of time travel are weird. But the science is weirder.
269 Years of Time Travel
A brief history of the subject, in both science and fiction, with help from the TV and film experts of Comedy Central's Beat the Geeks, Paul Goebel and Marc Heuck.
Our Man Goes to Skeleton Camp
Sports: Headfirst at 80 miles per hour on a steel platter. And you thought bobsled and luge were scary.
Terror at 170 Feet
Thrills: On the new (2,400-hp!) world's fastest roller coaster.
Nature or Nurture?
Books: Neither nature nor nurture, argues controversial author Paul Ehrlich.
How are underwater tunnels built?
In 1818, a French engineer invented a device that enabled workers to tunnel under rivers without having mud and water ruin their efforts.
Popular Science's FYI editor compiles facts about the telescope.
What do people who have been blind since birth see in their dreams?
Someone who was born blind experiences sounds, smells, and sensations while dreaming, but are their dreams visual?