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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.

OPT: [-] Put the toothpicks farther apart than you need them to be. Point the toothpicks at a distant object, such as a tree branch, or a person in the wilderness.; [-] Turn off all the lights and shine a flashlight on the toothpicks. The flashlight will represent the sun in this experiment.; [-] If you find that one toothstick breaks during the experiment, then the orange is the sun. If you find that one toothstick breaks during the experiment, then it is a moon.; [-] Measure 2 " x 1 " in front of you and place the pointed end of a 4-inch (10-cm) stick between the two toothpicks. To do this, place the flat end of the stick between 2 toothpicks.;
Turn off all the lights and shine a flashlight on the toothpicks. The flashlight will represent the sun in this experiment.