I can run swiftly and silent...
[5431] I can run swiftly and silent... - I can run swiftly and silently when you want me to stay still, I can move slowly and cautiously and am yours to fill. You look at me often and yet you always forget me, I am the most feared killer, yet you can't live without me. Sometimes you have me for all to spare, Yet when you need me, I am not there. You can waste me, or cherish me, you choose the track, But once you're done you can never get me back. What is it? - #brainteasers #riddles - Correct Answers: 37 - The first user who solved this task is Djordje Timotijevic
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I can run swiftly and silent...

I can run swiftly and silently when you want me to stay still, I can move slowly and cautiously and am yours to fill. You look at me often and yet you always forget me, I am the most feared killer, yet you can't live without me. Sometimes you have me for all to spare, Yet when you need me, I am not there. You can waste me, or cherish me, you choose the track, But once you're done you can never get me back. What is it?
Correct answers: 37
The first user who solved this task is Djordje Timotijevic.
#brainteasers #riddles
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August Krogh

Died 13 Sep 1949 at age 74 (born 15 Nov 1874). Schack August Steenberg Krogh was a Danish physiologist and zoologist who received the Nobel Prize for Physiology or Medicine in 1920 for his discovery of the motor-regulating mechanism of capillaries (small blood vessels). Working with frogs, which he injected with Indian ink shortly before killing, he showed that in sample areas of resting muscle the number of visible (stained) capillaries was about 5 per square millimeter; in stimulated muscle, however, the number was increased to 190 per square millimeter. From this he concluded that there must be a physiological mechanism to control the action of the capillaries in response to the needs of the body (not just flow due to heart beating). Krogh's research linked exercise physiology with nutrition and metabolism.
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