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How to prove the earth is round
Stick 2 toothpicks into the side of an orange.
Place the toothpicks about 1 inch (2.5 cm) away from each other. In this experiment, the orange will represent the earth, and the toothpicks will represent objects located in 2 different countries on earth.
Turn off all the lights and shine a flashlight on the toothpicks. The flashlight will represent the sun in this experiment.