Earth Day was first celebrated in 1970, marking the beginning of the modern environmental movement. Saturday morning marked ...

Warm air can still rise from a mountaintop, but it’ll be cooler to start with than air down at sea level, just because it’s ...

And that means kids in space. Providing the nurturing care they'll need will not be easy. Right now, 100% of the human species calls Earth home. But very soon, on the timescale of human ...