Top news for December 21, 2008

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Best air purifiers 2022: Top picks from Levoit, Dyson and more

Stingrays and zebra mbuna fish know how to add and subtract

We finally have a fully complete human genome

Space calendar 2022: Rocket launches, sky events, missions & more!

On This Day In Space: May 25, 2008: NASA's Phoenix spacecraft lands on Mars

Venus: The scorching second planet from the sun

Mercury: The smallest and closest planet to the sun

Halo games, ranked worst to best

Apollo 13: Facts about NASA's near-disaster moon mission

Ukraine invasion's impacts on the world of science: Live updates