EUREKA! The Archimedes Discovery While Taking a Bath....how to measure density..

HOW TO MEASURE DENSITY

           King Hieron of Sicily, wanting to find out if a crown he had been given was made of solid gold, or whether he had been palmed off with on containing silver, asked Archimedes to solve the problem. But how was he to do so without melting down the metal and destroying the crown? Interestingly while  taking a bath, Archimedes noticed the water level rose when he got in, and he realized that he could determine the gold density of the crown by weighing it in water. He was so excited by this discovery that he reputed to have rushed out naked into the street shouting "EUREKA!"  ("I have found it") .
                 Archimedes was born in 287 b.c.e. in the Greek city-state of Syracuse, Sicily, and is also credited with inventing the lever and the Archimedes screw - a device for lifting water  - and for setting fire to Roman ships using mirror and sun's rays during the siege of Syracuse.  When the city fell in 212 B.C.E., Archimedes, so it was said, was killed by a Roman soldier because he ignored a commend to leave his mathematical diagrams. Archimedes was held in great respect by the ancient world, both as a practical and theoretical  scientist . He wrote on mechanics, hydro-statics, catoptrics (refraction), and mathematics. Although much of his work is lost, his surviving writings were known to Islamic mathematicians in the middle ages. ................ 

MOST POWERFUL BOMB (H-bomb) WIPES OUT ISLAND

MOST POWERFUL BOMB (H-bomb) WIPES OUT ISLAND

           In 1954 The US today exploded the most powerful bomb ever made - and tiny  Bikini Atoll in the south Pacific died. The explosion was the equivalent of 15 million tons of TNT - hundreds of times more powerful than the weapons that destroyed Hiroshima and Nagasaki in 1945. The " Bravo" test of the world's first full-scale hydrogen bomb was a complete success. Cameras were there to record the awesome flash and the immense mushroom cloud - the symbol of our post - war era. But the bomb was apparently even more powerful than expected: the shock went right off the dials of the recording instruments. Though the atoll was cleared of islanders and the seas were patrolled, there are reports that Japanese fisherman on boats more than 70 miles from the blast have been seriously burnt by white ash that fell from the sky. In a smaller test blast two years ago , a complete island vanished.  This puts the US well ahead in the arms race, but it is only a matter of time before the Soviets test their own H-bomb.