
Magnetite, one of the hardest metals on earth (which is also a highly magnetic crystal) has been discovered in the brains of humans and animals. In fact, each human brain contains about seven billion particles of magnetite, weighing a total of one-millionth of an ounce. Some scientists believe that this might help explain how animals such as birds can navigate so well using magnetism. That fact that a brain can synthesize magnetite is "sure to astound most scientists." (Learn More)
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