Gravity

Have you ever wondered why..... All the planets in space Go round and round around each other And not fly off in different ways? Have you ever wondered why.... The ball you were holding in your hand When thrown up towards the sky Took a U-turn back to land? Have you ever wondered why.... With your feet firmly planted on the ground You were not like a balloon Floating amongst the mighty clouds? Have you ever wondered why.... The waves of an ocean Had a higher or lower reach Depending on the moon's motion? A genius, named Sir Isaac Newton Once slept under an apple tree He found the answer to all your questions And thus discovered the Theory of Gravity!