Brain Teasers User Profile
Zaki Din
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RadioactivityIn 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. |
The End Is Near!
A local priest and a pastor were fishing on the side of the road. They thoughtfully made a sign saying, "The End is Near! Turn yourself around now before it's too late!" and showed it to each passing car. One driver who drove by didn't appreciate the sign and shouted at them, "Leave us alone, you religious nuts!"
All of a sudden they heard a big splash, looked at each other, and the priest said to the pastor, "You think maybe we should have just said 'Bridge Out' instead?"