Citizens of Africa's second-most populated country broke a world record when they planted 353,633,660 tree seedlings on Monday as part of a national reforestation campaign.
The Trump administration's latest pick to manage nearly a quarter-billion acres of public land doesn't think the government should own land. But can he do anything about it?
A majority of Greenland's ice sheet is experiencing above-freezing temperatures this week, which could cause record melting and raise global sea levels.
This week marks the 50th anniversary of the first spaceflight to put humans on the moon. We went into the NASA archives of the Apollo 11 mission to remember the uncertainty and wonder of that week in 1969.