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Hứa Toàn Phong

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MATH PUZZLE: Can you replace the question mark with a number?

Sergey Nikolayevich Winogradsky

Died 25 Feb 1953 at age 96 (born 1 Sep 1856).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.]

Why are you crying?

Two guys were sitting outside a medical clinic. One of them was crying, tears were pouring down his face.

The other guy asked, "Why are you crying?"

The first one replied, "I came here for blood test."

The second one asked, "So? Why are you crying? Are you afraid?"

The first guy replied, "No. Not that. During the blood test they cut my finger."

Hearing this, the second one started crying.

The first one was astonished and asked the other, "Why are you crying?"

Then the second guy replied, "I have come for a urine test."

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