Pennsylvania is in the midst of an energy boom — but oil and gas drilling isn't new to the Keystone State. In fact, the world's very first oil well was drilled in northwestern Pennsylvania. The recently-renovated Drake Well Museum tells the story of the first oil rush.
On the 150th anniversary of the Battle of Antietam, a look at what the North and South were trying to achieve on the battlefield that day and how Antietam ended up changing the nature of the Civil War.
Some of the biggest human migrations coincided with major changes in climate, according to a new analysis. Researchers say early humans set out in search of climates where more food was available. And some populations stayed put in certain locations because barriers like glaciers blocked their progress.
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