Will the Sun Shine Forever?
The Sun is a giant nuclear furnace. In its core, at about 15 million °C, it fuses hydrogen into helium. Each helium nucleus weighs a little less than the four hydrogen nuclei that made it, and the missing mass becomes energy, according to Einstein's…
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Engineering
Leaning Wonder of Engineering
Most everyone is familiar with the famous Leaning Tower of Pisa. It's known not so much for its engineering,…
Astronomy
Voyager Phone Home
After historic visits to Jupiter and Saturn, Voyager 1 is now on course to be the first human-made object to…
Geology
Water In The Ground
Some water underlies the Earth's surface almost everywhere, beneath hills, mountains, plains, and deserts. It…
Mathematics
Eratosthenes Measured Earth’s Circumference—Centuries Before Columbus Sailed
Eratosthenes (c. 276 – 194 BC) was born more than 2200 years ago in the Greek city of Cyrene, now a city in…