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salamat baloch

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Radioactivity

In 1896, Henri Becquerel read a report to the French Academy of Sciences of his investigation of the phosphorescent rays of some “double sulfate of uranium and potassium” crystals. He reported that he placed the crystals on the outside of a photographic plate wrapped in sheets of very thick black paper and exposed the whole to the sun for several hours. When he developed the photographic plate, he saw a black silhouette of the substance exposed on the negative. When he placed a coin or metal screen between the uranium crystals and the wrapped plate, he saw images of those objects on the negative. He did not yet know yet that the sun is not necessary to initiate the rays, nor did he yet realise that he had accidentally discovered radioactivity. He would learn more from a further accidental discovery on 26 Feb 1896.

Emergency Landing

At 8 p.m. one night, a pilot who had run out of fuel made an emergency landing at a top-secret government base. He was quickly surrounded by security and taken inside to be interrogated. The interrogation was grueling because they wanted to make sure it was an unplanned landing and he was not a spy.
The interrogation lasted all night. At 6 a.m. they refueled his plane and let him go with his promise never to return. Four hours later he returned and landed again.
Security met him on the runway. They asked him why he had come back.
'I know I promised never to return but I brought my wife and now you have to tell her where I was all night...'

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