But if we tilted Earth's axis even more, to 90 degrees, the US would get sunlight 24/7, around the clock, for months on end. And it's not just the US; the entire Northern Hemisphere would be like ...

What If is a Webby Award-winning science web series that takes you on a journey through hypothetical worlds and possibilities, some in distant corners of the universe, others right here on Earth." ...

The Earth's interior is composed of four layers, three solid and one liquid—not magma but molten metal, nearly as hot as the surface of the sun. The deepest layer is a solid iron ball, about ...