References

Buying Guide Looking to check out macOS? Here are the best MacBooks for students you can buy right now.

Here's a look at past winners of the Nobel Prize in Physiology or Medicine.

Buying Guide These are the best electric toothbrushes for kids, from Oral B Kids and Philips Sonicare for Kids to AutoBrush Sonic Pro.

Vlad the Impaler was a medieval prince whose bloodthirsty acts inspired the world's most famous vampire, Bram Stoker's Dracula.

BUYING GUIDE These are the best treadmills you can buy in every category, from NordicTrack x22i and Mobvoi Home Treadmill to Peloton Tread.

Basic information about the Artemis program's Space Launch System and Orion capsule.

Discover interesting facts about how traits are passed down over generations through DNA.

New scientific techniques are helping us reconstruct people from the past in uncanny detail.

Homo erectus is associated with a number of firsts in its 2 million years of existence, including being the first hominin to travel out of Africa.

REFERENCE Equinoxes occur twice a year, with night and day being almost the exact same length all across the world. The next equinox is the September fall equinox, beginning on Sept. 22, 2025 in North America.