Blood sugar, or glucose, is an important source of energy and provides nutrients to your body's organs, muscles and nervous system.
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.
Of all the living animals in the world, these are the ones with the longest arms, relative to body size.
Humans will likely never run out of regular, mundane ideas, but whether will will run out of big ideas is a more nuanced issue.
Do scientists know if Earth is shrinking or expanding, and if this difference over time will threaten life on our planet?
Here's what historians have to say about whether Benjamin Franklin really flew a kite tied to a key during a lightning storm.
Researchers have several ideas as to why people sometimes stick out their tongues when they're concentrating.
Here's the science and psychology behind why drinking a warm glass of milk may help you fall asleep.
The sun is in its main sequence, but how do scientists know when our nearest star will begin to call it quits?