'Johnny, where's your homework?' Miss Martin said sternly to the little boy, while holding out her hand.
'My dog ate it,' was his solemn response.
'Johnny, I have been a teacher for eighteen years. Do you really expect me to believe that?'
'It's true, Miss Martin, I swear,' insisted Johnny. 'I had to force him, but he ate it!'
Atomic chain reactionIn 1942, the first self-sustained nuclear chain reaction was demonstrated in Chicago, Illinois. At the University of Chicago, Enrico Fermi and his team achieved the world's first artificial nuclear chain reaction, in a makeshift lab underneath the University's football stands at Stagg Field. Work on the experimental pile had begun on 16 Nov 1942. It was a prodigious effort. Physicists and staffers, working around the clock, built a lattice of 57 layers of uranium metal and uranium oxide embedded in graphite blocks. A wooden structure supported the graphite pile. The chain reaction was part of the Manhattan Project, a secret wartime project to develop nuclear weapons, which initiated the modern nuclear age. This was a discovery that changed the world. |
