Hundreds of millions return to their home villages around the Chinese New Year. In a week to 10 days, 3.6 billion passenger miles are clocked on trains, buses, and cars.
Scientists have analyzed the genomes of two of the world's most devastating plagues - each killed about half the people in Europe. The findings suggest a new strain of plague could emerge in humans again.
The little robotic explorer is China's first on the moon. The Chang'e 3 that carried it set down in December. The rover might not survive the lunar night.