Top news for December 21, 2008

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A pig kidney has been transplanted into a human successfully for the first time

Boeing Deepens NASA Starliner Probe, Prompting More Delays

Global fossil fuel extraction plans are double what we can safely burn

Microplastics May Be Cooling—and Heating—Earth’s Climate

Hit the Sleep “Sweet Spot” To Keep Brain Sharp: Too Little and Too Much Sleep Linked to Cognitive Decline

Rocket launch today: SpaceX launching US spy satellite in morning liftoff

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

13 Face Masks Your Kids May Actually Wear

20 of the weirdest sharks

Mix-and-Match Covid Boosters: Why They Just Might Work