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This World War II timeline highlights important dates from April 1940 to December 1940. Follow the events of World War II and the German invasion.

HIV continues to be a major global public health issue, having claimed more than 35 million lives so far.

DNA evidence is explained in this article from HowStuffWorks. Learn about DNA evidence.

A hydrogen fuel cell is an electrochemical energy conversion device. Learn why governments are pouring money into fuel cell research.

While Abraham Lincoln's Emancipation Proclamation didn't free the slaves, it was a crucial political move. Read about the Emancipation Proclamation.

The Apollo program was initiated with the goal of landing a man on the moon. What was the spacecraft that helped make this giant leap for mankind?

From Beijing to Boston, chicken pox has plagued millions of children and adults. See how chicken pox works.

Socialism is an economic system that promotes societal equality. Learn how socialism differs from forms of government like capitalism and communism.

Police academies turn average people into crime fighters. Want to become an officer? Learn what training police academies require.

Art heists are dangerous but can earn thieves some serious cash -- if they find the right buyer. Learn about the top five most impressive art heists.

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