All of our scientific tools have limits. These limits ensure that we will never see the whole picture. We can never have complete knowledge of the universe. Above, the ESO's APEX radio telescope probes the heavens from its lonely perch on Chile's Chajnantor plateau.
Fabien Cousteau sits inside Aquarius Reef Base in 2012. If he is able to remain under water for 31 days, he will have lasted one day longer than his grandfather, Jacques Cousteau.
A worker holds a white rodent at the State Key Laboratory of Biotherapy in Chengdu, China. Researchers at McGill University in Montreal found that mice left alone with a man had increased levels of the hormone corticosterone.
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A view of Venus, black dot at top center, passing in front of the sun during a transit in 2012. A quarter of Americans questioned failed to answer correctly the most basic questions on astronomy.
The Chinese flag is seen in front of a view of the moon at Beijing's Tiananmen Square in December, when China's first moon rover touched the lunar surface. That feat was widely celebrated — but observers believe the rover has now run into serious trouble.
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