Humans are born with about 300 bones, but these fuse together as we grow. By the time a person is an adult, they only have 206 bones. One of the most obvious cases of bones fusing is that of the human skull. Although babies have a soft spot on their heads, as they grow, the bones of the skull fuse and harden, covering it. This fusing doesn't happen overnight though: the last bone solidifies in the body around the age of 18.
More talking points about bones:
The adult human skull is comprised of 22 bones.
Most bones in the human body do not directly touch any other bone. They are separated by ligaments, muscles, and cartilage. This is actually a good thing, since it can be very painful when bones grind against each other, as in the case of someone with severe arthritis.
Only about 3% of animals that possess a backbone or spine.
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