Clip Joint1b, 2i, 3h, 4a, 5f, 6e, 7g, 8c, 9d SEE MY POINT?
The four mistakes: The line where the lead joins the wood should appear straight across; the exposed wood area should be smooth, without edges; the scallops where the paint meets the wood should arch up instead of down; the middle panel of the hexagonal part of the pencil should appear twice as wide as the two side panels. In addition, most pencil sharpeners create an angle that is about twice as sharp as the one shown here, but some sharpeners do produce blunter angles. ACCIDENTAL INVENTIONS1g.
When Jolly tried to rub out the stain, the tablecloth got cleaner. Turpentine smells bad and is flammable, so modern dry cleaners now use other liquids. 2e.
By mixing nitroglycerin with a special soil, Nobel created an easy-to-handle explosive. He later used his fortunes to found the Nobel prize. 3d.
Oil-field workers often took the waxy residue from the machinery and used it to help heal wounds. It took 10 years for Chesebrough to develop this substance into a colorless, odorless petroleum jelly. 4h.
Modern paper is made from wood, not cotton rags, as are wasp's nests. 5a.
The weapon was tied to a string for quick retrieval. 6c.
The powder turned out to be surprisingly inert and slippery. Teflon remained a military secret until after World War II. 7i.
The second thing Spencer held in front of the equipment was a bag of unpopped popcorn. 8b.
De Mestral put the cockleburs under a microscope and saw that the spikes ended in little hooks. 9f.
Schlatter licked his fingers and noticed the substance tasted sweet. Other artificial sweeteners have been discovered through similar accidents. 10j.
The fumes from the superglue (cyanoacrylate) condensed on the fingerprint oils, making them visible.
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