Two years ago, Elon Musk had an idea. What if, instead of traveling by road, rail, air, or boat, we all travelled in giant tubes that could move pods of people at up to 800 miles per hour? He called the idea the Hyperloop and released his idea to the world hoping that someone else would do the building part, while he worked on other massive projects like Tesla and SpaceX.
In the July 1963 issue of Popular Science, we detailed the work of Jacques Cousteau, an oceanographer who was building the Conshelf II -- an underwater habitat where he would set a world record living under the sea for 30 days. At the time,Cousteau predicted that “within 50 years a new breed of humans—Homo aquaticus, the Water Man—will live under water without an air supply.”
Mention time travel at a nerd party, and other guests will immediately respond with a grim conundrum: What happens if a time traveler goes back in time and kills one of his ancestors? This is the “Grandfather Paradox.” In a simulated environment, a team of mathematicians tested the paradox, and made a remarkable discovery: In time travel simulations, at least, history repeats itself.