I watched a video on PBS Nova called Revealing the Origins of Life. I learned that life on earth probably started billions of years ago by a single celled organism. This organism was made up of Hydrogen, Oxygen, Carbon, and Nitrogen. It also started to form in a small pond where there was lots of sunlight.
I also watched a video called Evolution of Laughter. It explained that us humans start to laugh at the age of three months. Scientists say that the laugh evolved from four other monkeys. First the orangutan, then the gorilla, then the chimpanzee, then the bonobo, which then led to us. Scientist also say that the louder the you have, the more happy you are.
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