The first hominids will have left their marks 3 or 4 million years ago.
One feature seems to distinguish them from other animals: the bipedal gait . The hip bones have the proper configuration so that these animals can walk with their heads held high and their arms available for a thousand and one tasks. They built objects and even figured out how to make fire appear in a piece of wood.
Afterwards, Homo sapiens sapiens has 1,300 cm2 of brain that holds some prodigious abilities in its mind.
Its body, like that of many other animals, harbors fascinating secrets that are worth discovering.