Nature Podcast – This week we bring you news from the year’s biggest neuro jamboree, stick our heads into the oldest turtle fossil ever found, talk to the author of a new book on photosynthesis, and discover the source of water vapour jets on Saturn’s sixth moon.

Minerals yield signs of early plate tectonics

Evidence of 4-billion-year-old subduction points to an early start for modern-Earth geology.

Cosmic-ray hot spots puzzle researchers

Proton discovery may cast doubt on dark-matter theories.

Greenland gambles on warmer, richer climate

As melting ice uncovers natural resources, Greenlanders vote to step closer to independence.