A guy in India built a gas powered "tree bike" that can climb up the side of 100-foot-tall trees. It looks more like a carnival ride than a bike. He's sitting on a seat with a harness and he's FACING the tree trunk. When he gives it gas, it slides UP the tree. If you're wondering why he bothered, it's so he can harvest the "areca nut." It's a popular crop that has medicinal properties in some parts of the world, but if it's used wrong, it's harmful.
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