Challenger by name, challenging by nature.
Crabby bodies are so evolutionarily favorable, they've evolved at least five different times. So why does this process, known as carcinization, keep happening?
A new study questions if our planet could capture rocky and icy visitors from outside the solar system — and how scientists could spot them.
From Prometheus and Methuselah to trees in remote forests of China, these are the most ancient known trees on Earth.