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Ana Kabanica

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last 3 solved tasks
Which number should replace the question mark?
How much is 4x5?

Hans Berger

Born 21 May 1873; died 1 Jun 1941 at age 68.German psychiatrist who recorded the first human electroencephalogram (EEG). In 1929, he devised a system of electrodes which he attached to his son's skull, and connected to an oscillograph. This gave a recording of brain waves - the rhythmic changes in electric potentials. The most prominent of these rhythms he labelled "alpha waves" and "beta waves."

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Back 2 work, it's Monday!
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