Here's why some Maya city states fell about 1,000 years ago.
Life's Little Mysteries answers fascinating questions about the world around you and the stuff in it, including wild questions you didn't even know you had.
And check out our "Life's Little Mysteries" podcast, where we answer questions about mysteries big and small — about ancient civilizations; our planet and solar system; the plants and animals that live alongside us; our bodies and how they work; and more. Listen in on Apple podcasts, Spotify and Audioboom.
Some animals, such as poison dart frogs, carry enough toxic chemicals to kill multiple adult humans, but they've evolved tricks to avoid poisoning themselves.
Dogs regularly wag their tails to greet humans and other dogs, but what about their wild counterparts? Do wolves wag their tails?
These planets are mostly made of gas, but a spaceship would have a rough time trying to get through a giant planet like Jupiter or Saturn.
Humanity is feeling the effects of climate change around the world, but could climate change make humans go extinct?
The aging process doesn't happen equally on both sides, leaving the human face increasingly less symmetrical with age.
Scientists have figured out the average color of the universe by recording visible light from more than 200,000 galaxies.
With its frigid temperatures, remoteness from the sun and general dustiness, changing Mars to be more Earth-like is more challenging than it seems (and it already seems pretty tough).
Despite sharing almost 100% of their DNA, identical twins have different fingerprints, thanks to unique environmental factors.