Right Now in Science
Our knowledge of space changes all the time as new discoveries are made. But some ideas about the universe have never really held water – including the one that everything is made of frozen H2O.
Imagine whipping through the sky at thousands of miles per hour. This special type of jet engine can do exactly that.
Whether it's checking your look in a mirror or using a smartphone, we've come to rely on glass so much that it's nearly impossible to imagine life without it. But what exactly is this remarkable material? Solid, liquid or other?
In space, no one can hear you scream — but they might be able to hear The Beatles' "Across the Universe." The idea of ETs listening to our radio signals or watching our TV shows is pretty far out, but is it even possible?
10 Crackpot Theories About Space
How Ramjets Work
Is glass really a liquid?
Could aliens really watch old TV shows?
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If this were trivia night, your team could probably summon this answer without breaking a sweat. But in true polymath style, Engelbart's signature invention is only part of his computer genius. Meet him.
In 1983, U.S. President Ronald Reagan announced a new plan for protecting against a nuclear strike: the Strategic Defense Initiative. Reagan's idea almost immediately earned the unwelcome nickname "Star Wars." How much do you know about the program?