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I purge all that is evil, an...

I purge all that is evil, and keep all that is true. Unless you speak, I can delete what you said. My usefulness has faded with the use of a pen. I am usually made of rubber, yet I am not a toy. I am both pink, and white, but also blue, or green. Do not forget me, as I can be your best friend. What am I?

Correct answers: 47

The first user who solved this task is Djordje Timotijevic.

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Can't Do Without It

Duct tape is like 'The Force'...
It has a light side and a dark side, and it holds the universe together.

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Alexis Claude Clairaut

Died 17 May 1765 at age 52 (born 7 May 1713).French mathematician who, as a child prodigy at age ten was studying calculus, tutored by his father. Clairaut read his first paper, Quatre problèmes sur de nouvelles courbes to the Paris Academy (1726) at the age of 13. He accompanied Maupertuis on an expedition to Lapland to measure the length of the meridian. From this experience, he began a book (1743) on the shape of the rotating earth under the influences of gravity and centrifugal forces. Further, he showed how to measure the shape by use of measurements of the effect of gravity at different location on the swing of a pendulum. He also determined the first reasonable value for the mass of Venus, an improved value for the mass of the moon, and predicted the timing of the return of Halley's Comet.

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