Latest about Life's Little Mysteries
Why do caffeine withdrawal headaches hurt so much?
It's still largely a mystery why caffeine withdrawal causes headaches, but researchers have a few ideas.
How many moons are in the solar system?
The solar system has many more moons than the one we can see in the sky. But how many do we actually know about? And how many more are waiting to be discovered?
What's the difference between a llama and an alpaca?
Llamas are closely related to alpacas, so how can you tell these South American camelids apart?
Why do some people grow 'chemo curls' after cancer treatment?
After chemotherapy, some people get "chemo curls" and other changes to their hair texture and appearance. But why?
What was the first human species?
Modern humans emerged roughly 300,000 years ago, but our genus Homo is much older. So what's the oldest human species on record?
What would space sound like if we could hear it?
In space, no one can hear you scream — here's why.
Can you dream during non-REM sleep?
People report vivid dreams during rapid-eye-movement sleep. But is this sleep stage really the only time we dream?
Why do cats and dogs eat grass?
There are many theories for why cats and dogs eat grass, and some could be "old wives' tales."
