Sharp Edges facts

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Obsidian can be made into surgical scalpels by flint knapping, creating an edge only one molecule wide and the edge is so smooth and sharp it can cut between cells.

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In 1974, the Consumer Product Safety Commission issued 80,00 lapel buttons promoting toy safety. The buttons later had to be recalled because they contained lead paint, had sharp edges, and were considered a choking hazard.

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1. In today's world, chert has very few uses, but many ancient cultures used it to make tools for cutting and scraping and also used it to make weapons like arrowheads and ax heads. It is very hard and durable and the edges of chert are very sharp.

2. Sculpin has fan-shaped pectoral fins. Lower edge of pectoral fins is webbed and covered with sharp rays which facilitate gripping to the substrate. Unique morphology of pectoral fins ensures survival in the fast-flowing waters.

3. Not only do crystals have sharp edges but they also consist of flat faces called facets.

4. Saw shark has long snout edged with sharp teeth which alternate in size (smaller teeth are inserted between larger teeth).

5. Velociraptor had 13 to 15 teeth in the upper jaw and 14 to 15 teeth in the lower jaw. Its teeth were sharp, widely separated and serrated on the edges.

6. Grass leaves contain tiny stones made of glass (phytoliths). These are responsible for the leaves sharp edges and also make them more difficult to digest.

7. Caribou's hooves are shaped in such a way that they act like snowshoes in the snow, and paddles in the water. The hollow center is useful for scooping through snow to search for food, and the sharp edges of the hoof helps caribou when walking on ice or rocks.

8. The U.S. Consumer Product Safety Commission had to recall 80,000 of its own lapel buttons promoting "toy safety", because the buttons had sharp edges, used lead paint, and had small clips that could be broken off and subsequently swallowed

9. Elephant grass has narrow leaves that can reach 2 to 3 feet in length and 1 inch in width. Leaves have prominent white central vein, pointed tips and razor-sharp edges. They are pale green colored and alternately arranged on the stem.

10. The sawgrass that is common in the Everglades is so sharp that its razor blade edges can cut through clothing.

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The reason kidney stones are so painful is because on a microscopic level they are covered in sharp, jagged edges

In formal cutlery, a dull-edged, rounded point knife is actually referred to as a table knife or "Butter spreader". Whereas a butter knife, or "Master butter knife", is sharp-pointed, often with a sabre shape, used only to serve out pats of butter from a central dish. - source

Tyrannosaurus rex had 4-feet-long jaws filled with 50 to 60 sharp teeth. They were conical in shape, serrated on the edges and 12 inches long (much larger compared with teeth of other carnivorous dinosaurs).

Cheung Kong Center is one of the few conventionally designed buildings on Hong Kong Island because a Feng Shui master was consulted on ways to “absorb the negative energy coming from the Bank of China Tower’s sharp edges”

Bay leaves are used as condiment, to improve flavor of soups, casseroles, sauces and stews. Leaves can be used dry or fresh. Dried leaves are more aromatic. Unlike other spices, bay leaves are added at the beginning of cooking because they require time to release flavor. Bay leaves have sharp edges that can injure mouth, and they need to be removed from a dish before serving. Dried, ground leaves can be safely consumed.

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A mosquito’s proboscis has 47 sharp edges on its tip to help it cut through skin and even protective layers of clothing.

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According to a defector, North Korean Special Forces punch trees 5,000 times in a row, day and night, for a month to strengthen their fists. Afterwards, they punch the sharp edge of a tin can until their knuckles bleed then top it off by punching a pile of salt.