With one of the world's most precise atomic clocks, physicists have observed time dilation, confirming Einstein's theory of relativity.
Russian troops have captured the Chernobyl nuclear power plant, which still contains nuclear waste that could pose a threat to the surrounding area.
Cheetahs are unique members of the big cat family, with bodies built for acceleration and short bursts of incredible speed.
Scientists discovered an absolutely massive bacterium that can be seen without the aid of a microscope and lurks among the mangroves of Grande-Terre in the Caribbean.