Do sharks have bones?
Sharks don't have bones. Their skeletons are made of cartilage, the same flexible material in human ears and noses, which makes them lighter and more flexible.
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Skeleton Facts
Skeleton facts and facts about skeletons, from the Random Facts shelf.
11 facts on this shelf
How many bones are in the human body?
Adults have 206 bones, while babies are born with around 300 that later fuse together.
What is the smallest bone in the body?
The smallest bone in the body is the stapes, in the middle ear.
What is the longest bone in the body?
The femur, or thigh bone, is the longest and strongest bone in the body.
Where are most of the body's bones?
More than half of the body's bones are in the hands and feet.
How many blood cells does bone marrow make?
Bone marrow makes hundreds of billions of new blood cells every day.
How often is the skeleton replaced?
The adult skeleton is gradually replaced about every 10 years.
Which bone isn't connected to any other bone?
The hyoid bone in the neck is the only bone not connected to another bone.
Is the funny bone a bone?
The "funny bone" isn't a bone. It's the ulnar nerve.
Does cracking your knuckles cause arthritis?
Cracking your knuckles doesn't cause arthritis. One doctor cracked the knuckles of only one hand for 60 years to prove it.
Do astronauts lose bone in space?
Astronauts can lose about 1% of their bone mass per month in space.