In last week's science wrap-up, I relayed a story about a lake in the Andes that had gone missing. It was there in March, but when scientists returned for a routine check in May, all that was left was a 100-foot crater and some sheets of ice. Reuters is reporting that scientists have found the cause of the lake's disappearance and, no, it was not Carmen Sandiego. A buildup of water created a crack in a wall of ice on one side of the lake, allowing the water to pour out into a fjord leading to the sea. Glacier expert Andres Rivera, who led the expedition, says the incident isn't so rare in the region, but it doesn't usually get noticed because of the low population density. The good news is that the Chilean lake, which is sustained by melting glaciers, appears to be filling up again. Still, it's going to be a while before I'd feel comfortable planning a vacation there.