Summary: How are weather forecasts made? Are they accurate, and if not why not? And how do we know when extreme weather is on the way? Also, what about on other planets and moons? To find out, we talk to the teams who study weather and climate patterns, both on Earth and elsewhere in the solar system. Plus, scientists discover the world's oldest water, signs that selfishness kickstarted agriculture, and why butterflies with more melanin fly further...
