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Venkat Katrala

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

Karl von Vierordt

Died 22 Nov 1884 at age 66 (born 1 Jul 1818).German physician and professor of medicine who invented the sphygmograph (1854), the first instrument to trace a human pulse by a non-invasive measurement of blood pressure. His method of using weights and a mechanical balance was crude, but did establish the principle that blood pressure could be measured by finding the counter pressure needed to balance the arterial pulsation. In 1852, he developed a technical method by which blood cells could be counted (though too tedious to gain widespread use). Vierordt also devised the hemotachometer to monitor the speed of blood flow. He made spectrographic analyses of haemoglobin solutions, bile, and urine and also studied respiration and sound conduction.«

Undercover Detective

A tourist asks a man in uniform, "Are you a policeman?"
"No, I am an undercover detective."
"So why are you in uniform?"
"Today is my day off."
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