Lunar Eclipses
For as long as humans have been watching the night sky, they noticed that every so often, during a full moon, the moon would briefly go dark, or at least change color. They often created mythical ex...
13 Mar 202514min
The Crossbow
One of the most devastating weapons in the medieval world was the crossbow. It evolved from early hand-held projectile weapons into a powerful tool of warfare that shaped battles for centuries. It ...
12 Mar 202515min
Emperor Claudius (Encore)
Tiberius Claudius Caesar Augustus Germanicus, known to history as Claudius, was the fourth Emperor of Rome. Of the emperors that came before him and all those who came after him, he was the most unl...
11 Mar 202513min
Messier Objects
In the 18th century, a French astronomer who was a regular comet hunter kept finding things in the sky that weren’t comets, but they also weren’t stars or planets. He created a list of these objects...
10 Mar 202515min
Primate and Global Cities
Sponsors Mint Mobile Cut your wireless bill to 15 bucks a month at mintmobile.com/eed Quince Go to quince.com/daily for 365-day returns, plus free shipping on your order! Stitch Fix Go to stitc...
9 Mar 202514min
Artificial Turf
In 1965, the world’s first full enclosed sports facility, the Houston Astrodome, was opened to the public. The Astrodome itself was a marvel of engineering, but because it was enclosed, the grass th...
8 Mar 202516min
Hydropower
For thousands of years, humans have used the power of water to do work for them. At first, it was very simple, then it gradually evolved to more complex and more efficient devices to harness the pow...
7 Mar 202514min
The Maginot Line (Encore)
After the First World War in France, many generals thought that the end of the war was really just a pause before another war began. They wanted to make sure that the next time war broke out with Germ...
6 Mar 202513min
