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2011-04-12 12:50:00

On April 12, 1981, 20 years after Yuri Gagarin became the first human to reach space, NASA embarked on a new journey that would pave the way for space travel for three decades.


Word of the Day
ecotone
  • A transitional zone between two communities containing the characteristic species of each.
The word 'ecotone' comes 'eco-' plus a Greek root meaning 'tension'.