The arctic tern carries out the longest migration of any creature on Earth a journey of more than 36,000 kilometres (or 22,000 miles) from the Arctic to the Antarctic and back again, each year!
Stem cells may repair the brain
Stem cells may repair the brain Medical studies have shown that blood cells can
turn into brain cells. Bone marrow cells migrate in the body and
change into nerve cells. This implies that a normal brain is
maintained by cells from the bones. DECEMBER 1, 2000
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