Historical study tells lots of things. The fossil evidence found in 1978 by Mary Leakey and Paul Abell at Laetoli Footprint Trails, Tanzania can be dated back to about 3.6 million years ago. Human evolved to bipedal free the hand to work on other things marked the accelerated evolution since.
While the new freed hands can do much in hunting and crafts, the most significance is allow human to use hand to touch other hand – the beginning of love.
The fossil evidence on the Laetoli footprint trails, for the first time, showing a pair of larger and a pair of smaller footprints walking together at close, consistent distance is the first indirect proof of early family walked hand in hand, just like the one in this image, some 3.6 million later in Mandalay, Myanmar.
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