Allegedly about a million years ago we became humans as a result of evolution.Then we spent 900 thousand years learning to make and use tools;again another 90 thousand years getting acquainted with fire and its usefulness;again 9 thousand years becoming gradually experienced in farming;again 9 hundred years acquiring the skills in building machines...But in this century,the present hundred years,we've learned flying;achieved the use of nuclear energy--the ultimate energy we can ever tap;and succeeded in landing on the moon.It's said that we'll eventually be able to retain vitality against aging.We have boundless abilities and potentialities.So let us be blessed.
