Kangaroo fossil research showed that they may have learned to hop over 20 million years ago.
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The discovery of the chemical element Neptunium was announced.
Identical twins were no longer identical after one returned from a mission to space.
Dmitri Mendeleev presented the first periodic table.
Nineteen European nations forbade human cloning; however, the UK and Germany refused to sign the agreement.
Using gene therapy, eight babies suffering from 'bubble boy disease' were cured in Memphis, Tennessee.
