Kangaroo fossil research showed that they may have learned to hop over 20 million years ago.
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The first successful administration of insulin to treat diabetes was given to 14-year-old Leonard Thompson.
Researchers identified the earliest known prehistoric ancestor of humans.
While observing a compass needle, scientist Hans Christian Ørsted discovered electromagnetism.
Nikola Tesla tried to explain how the phenomenon of ball lightning works.
A Texan doctor performed the world's first successful partial skull and scalp transplant.
