UB PHY 151 - dms220 wenchao (2 pages)

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dms220 wenchao



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dms220 wenchao

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Pages:
2
School:
University at Buffalo, The State University of New York
Course:
Phy 151 - College Physics Lab 1

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The human hand played an important part in the development of stone tools Stone artifacts from 2 5M years ago help humans to hunt fish meat and to make fire In the period before the development of the stone ax the human ancestor s wrist weak The bone passes through the palm of the middle finger and the wrist and keeps the wrist stable when a person holds a small object between the thumb and the finger So they can not use the wrist to hold some small things With the time pass after entering the Neolithic Age the use of human hands more dexterous Human can use stone to grind into a knife shovel spinning wheel and so on tools or weapons So the stone tools make their life easy from 2 5M years ago If humans have 6 fingers instead of 5 fingers I think they might have some advantage Like they can use the extra finger to do something else The grip should be stronger playing basketball seems to be more control of the ball The keyboard will be based on six fingers design And the speed of typing will be faster But if we use 5 fingers everything will be simple cause the environment related With the evolution of mankind five fingers were more suitable for human survival then evolved into five fingers It is like the duck hand were four It also to adapt to the environment Our ancestor use stone tools by 5 fingers and if they use it by 6 fingers the hunting speed will be faster than before If we all have 6 fingers we may see the world changed People can hold 4 or 5 glasses on our hand The technology will adapt to 6 fingers Therefore 6 fingers would be convenience and speed up than nowadays human life



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