Newly-discovered fossil deposit contains more than 50 unknown species from the Cambrian Explosion, when most complex body plans appeared.
Planets closely orbiting red dwarf stars may have dynamic tectonic plates, making them more life-friendly than previously thought.
Scientists sound alarm over radiation in Nubian Aquifer, but other experts say the health risk is unclear.
Deep water reptiles diversified as Mesozoic sea levels rose. Their shallow water counterparts declined.