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In addition, over the next several years development was carried out to improve the adhesive’s properties. It was not until 1974 that the idea for Post-it Notes popped up. One Sunday, Art Fry, a chemical engi- 11 neer for 3M, was singing in his church choir when he became annoyed that the bookmark in his hymnal kept falling out. He thought to himself that it would be nice if the bookmark were sticky enough to stay in place but not so sticky that it couldn’t be moved. Luckily, he remembered Silver’s glue—and the Post-it Note was born.

It is very important to distinguish between observations and theories. An observation is something that is witnessed and can be recorded. A theory is an interpretation—a possible explanation of why nature behaves in a particular way. For example, in Chapter 2 we will read about Dalton’s atomic theory, in which John Dalton proposed that a chemical reaction is a reorganization of atoms in reacting substances to produce new substances. As we discussed, we know that mass is conserved (it is a natural law), and we can explain it by claiming that all matter is made of nonchanging atoms (the theory).

Post-it Notes are now available in 62 colors and 25 shapes. In the years since their introduction, 3M has heard some remarkable stories connected to the use of these notes. For example, a Post-it Note was applied to the nose of a corporate jet, where it was intended to be read by the plane’s Las Vegas ground crew. Someone forgot to remove it, however. The note was still on the nose of the plane when it landed in Minneapolis, having survived a takeoff and landing and speeds of 500 miles per hour at temperatures as low as 2568F.

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Chemistry History Of The Origin Of The Chemical Elements And Their Discoverers Bnl


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