When a Mars-sized meteorite slammed into Earth billions of years ago, the impact completely reset any and all chemical processes on Earth, leaving nothing from before. Or so we thought. Reading time: ...

You probably learned in high school chemistry class that core electrons don’t participate in chemical bonding. They’re thought to be too deep inside an atom and close to the nucleus to meaningfully ...

Could aliens be living deep inside Earth? Investigate the possibility of hidden life beneath the planet’s surface.