The world's first underground was the London Underground in1863. It has 275 stations and 253 miles of track.

Cotton crops can be sprayed up to 40 times a year making it the most chemical-intensive crop in the world.

Crocodiles and alligators are surprisingly fast on land. Although they are rapid, they are not agile. So, if being chased by one, run in a zigzag line to lose him or her.

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