Talk about a long-term power source. For billions and billions of years, the Sun has been giving off energy that equals 4 x 1026 watts. What keeps the Sun burning so bright?
Who said daydreams are a waste of time? One of Einstein's flights of fancy led to the equivalence principle—the knowledge that while an object is in free fall, it's free of gravity's effects.
Where to begin when a Web search turns up millions of sites about Einstein? Let us point you to some of the best—from Time's person of the century profile to a black hole animation.
Rice grows on more than 80 percent of Vietnam's farmland and is the country's main agricultural export. Take a look at rice's many shapes and forms; then cook up something that has your favorite!
What was once a harvest celebration in Vietnam has now become a holiday celebrating children, with toys, masks, and lanterns. Investigate the changing nature of holidays.
Meet one of the world's most influential scientists. Construct a compass and a flashlight. Find out how to pop through a wormhole. And further explore physics with these 10 kid-friendly titles.
Perfection certainly wasn't something to strive for, according to Einstein. In fact, he believed that messing up was a part of being successful—an idea that, itself, has proven relevance.
The mountain-building processes of folding and faulting take many millennia on Earth—and a matter of minutes in the lab. Learn how even small models provide a big-picture view of our dynamic world.
Do you know how to describe where you are in the fourth dimension? Or what it would take to turn a rabbit into a black hole? Explore the fascinating nature of space and time.
Until the late 18th century, most people believed the Earth was about 6,000 years old. Hutton changed this belief by proposing that geologic forces operate at the same rate today as in the past.