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Olympic rider drops out when horse is injured

Invasive fish with human-like teeth caught in California

13 wild milestones for women in the Olympics

Greenland sharks can live for over 400 years, new study shows

Mother bear rushes to aid of cubs caught in waterfall

Rio de Janeiro is invaded by giant, building-scaling athletes

Visit the far past in the lost city of El Mirador

Shifting sands uncover ancient treasures