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Calculate the number 725

NUMBERMANIA: Calculate the number 725 using numbers [4, 3, 1, 5, 75, 121] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 0

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Dolphin Smarts

Dolphins are so intelligent...
That within a few weeks of captivity, they can train a man to stand on the edge of their pool and throw to them fish three times a day.

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Heart surgery

In 1896, the first successful surgery on heart muscle was performed on 10 Sep 1896, by Ludwig Rehn in Frankfurt am Main, Germany, who sutured a myocardial laceration - a 1.5-cm wound of the right ventricle - of a 22-yr-old man stabbed in a drunken brawl. Previously, suturing of the pericardium, a fluid sac surrounding the heart - but not a part of the heart proper - was successfully executed by Americans Henry C. Dalton on 6 Sep 1891 and Daniel Hale Williams on 9 Jul 1893. These operations took place at a time when the prevailing belief was of the inviolability of the heart. Rehn's achievement is regarded as a landmark for the beginning of cardiac surgery.«

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