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tin alayon

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I am two-faced but bear only one, I have no legs but travel widely. Men spill much blood over me, kings leave there imprint on me. I have greatest power when given away, yet lust for me keeps me locked away. What am I?
Look carefully caricature and guess the name of musician.
If a491b + 12cc1 = 9cbac find number abc. Multiple solutions may exist.

Ernst Mach

Died 19 Feb 1916 at age 78 (born 18 Feb 1838). Austrian physicist and philosopher who established important principles of optics, mechanics, and wave dynamics. His early physical works were devoted to electric discharge and induction. Between 1860 and 1862 he studied in depth the Doppler Effect by optical and acoustic experiments. He introduced the "Mach number" for the ratio of speed of object to speed of sound is named for him. When supersonic planes travel today, their speed is measured in terms that keep Mach's name alive. His lifetime interest, however, was in psychology and human perception. He supported the view that all knowledge is a conceptual organization of the data of sensory experience (or observation).

True or false?

A little kid's in school, taking a true-false test and he's flipping a coin. At the end of the test he's flipping the coin again. The teacher says, "What are you doing?" He says, "Checking my answers."

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