New Scientist: SOMETIME this Antarctic summer, Sridhar Anandakrishnan will fly to the mouth of Pine Island glacier in West Antarctica. It's a dangerous place. "You get these monster crevasses," he says. "If your helicopter needed to set down, it's not a trivial matter." But glaciologists like Anandakrishnan need to take such risks to predict how much of the Antarctic ice sheet will end up in the ocean due to climate change. So he is developing "geoPebbles" - wireless, instrument-laden devices that can be scattered...