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Who is the mysterious person i...

Who is the mysterious person in the picture?

Correct answers: 23

The first user who solved this task is On On Lunarbasil.

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Handy Around the House

Susie: My husband is a great handyman. He can repair almost anything.
Jane: My mother always taught me to beware of the man that can fix everything. You'll never get anything new.

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Sergey Nikolayevich Winogradsky

Born 1 Sep 1856; died 25 Feb 1953 at age 96.Russian microbiologist who helped to establish bacteriology as a major biological science. He was first to isolate the bacteria responsible for nitrification and nitrogen fixation by soil bacteria (1890).Winogradsky also studied bacteria that recycle other vital elements for use by other organisms - including ‘iron bacteria', and those which metabolize sulfur (1887-9) - deriving metabolic energy from inorganic nutrients. Previously, only organic substrates were considered suitable for microbes. The "Winogradsky column" is still used as an enrichment culture that simulates the muddy habitat of anoxygenic photosynthetic bacteria.[Name also spelled Sergei or Sergius.]

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