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The dream of sending humans to Mars is closer than ever before. In fact, many scientists think that the first person to set foot on the Red Planet is alive today. But where should the first explorers visit when they get there? Horizon has gathered the world's leading experts on Mars and asked them: where would they go, if they got the chance - and what would they need to surviv...。Fifteen years ago, two teenage girls were murdered at Merrymaker Campgrounds. The case was filed an animal attack, the camp was condemned and the killer never found - but something horrific still waits in those woods.。