Everyone could do with a little extra science today, if only to distract themselves from the blank and empty yawn that is a Sunday afternoon. To celebrate their 125th anniversary, National Geographic is hosting a free-for-all interview with James Cameron, Robert Ballard, Jane Goodall and "explorers in the field on every continent." You can join the conversation here; explorers will be taking questions for the next hour.

This has been a truly excellent weekend for expedition-related news. If Paul Salopek's seven-year Out of Eden trek wasn't enough for you, perhaps British adventurer and official "greatest living explorer" Ranulph Fiennes' The Coldest Journey will suffice (it's worth clicking through for the pictures of the ice-clustered, bristling set of eyebrows on Ranulph alone).