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This is an example of a writing robot Handwriting is quite a difficult task for robots, but children find the result interesting.
simple robots
Superaccurate Clocks Confirm Your Hair Is Aging Faster Than Your Toenails
Out of sync. Because of the effects of gravity, a clock high on a wall should run ever so slightly faster than a watch just below it.
If you want to make really sharp stone spearheads, do like Stone Age cave dwellers did and cook them first. Palaeoanthropologists have discovered that this two-step trick was invented 50,000 years earlier than they previously thought.