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7 cards from across every topic, each citing a source. Tap one to open it in the feed.
- A large share of your energy goes into sorting salt.
The sodium–potassium pump pushes three sodium ions out and two potassium ions in per ATP molecule consumed. Cells …
- Most of your brain cells aren't in your cerebrum.
Your brain contains about 86 billion neurons, not the 100 billion long claimed. The distribution is the surprise …
- The liver is the only organ that grows back.
Remove a large part of the liver and the rest grows back to the original mass. On paper about 10 percent of the …
- You get a new skeleton every ten years.
Bone is living tissue under constant reconstruction. Osteoclasts eat away old material, osteoblasts lay down new. About …
- Your body builds 2 million blood cells every second.
Red blood cells live only about 120 days. Your bone marrow therefore replaces them non-stop: roughly 2 to 3 million new …
- Your brain has its own border control with bouncers.
The blood–brain barrier arises because the cells lining brain capillaries are sealed by tight junctions, wrapped by …
- Your outer skin is never more than a few weeks old.
The epidermis renews itself roughly every 4 to 7 weeks. New cells form in the deepest layer, migrate upward, harden …