SoT 170: A Big Year For Zircon

More details on Philae's rough landings, and the future of the first probe to land on a comet. Professor Monica Grady's reaction to the landing, the sound of the landing, and the comet 'sings'.
When a pair of scientists found their experiment contaminated from the DNA Isolation kits they were using, they set out to see if other experiments were similarly contaminated.
Researchers at Australia's James Cook University have discovered tiny zircon crystals on Vanuatu. But surprisingly, they seem to have originally come from Australia.
Scientists have descended into one of the three mysterious craters that have formed this year in Siberia, onto a frozen lake. The most likely explanation for the craters is a "catastrophic destabilization of Arctic methane stores due to human-caused warming".