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 中国人还发明了牙刷，这个很多人都不知道，提供两个连接,请看: |
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中国人还发明了牙刷，这个很多人都不知道，提供两个连接,请看: -- Anonymous - (118 Byte) 2005-1-05 周三, 上午7:39 (139 reads) |
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作者：Anonymous 在 罕见奇谈 发贴, 来自 http://www.hjclub.org
The Great Toothbrush Timeline
3000 B.C. - Ancient Egyptians end their meals by gnawing on "chew sticks," which are twigs with one end frayed into soft fibers for brushing teeth. Archaeologists studying tombs from this era have found many examples of these chew sticks.
500 B.C. - Wealthy Roman men employ slaves to clean their teeth. Teeth cleaning is part of their religious ceremonies.
1498 - The Chinese invent the true ancestor of the toothbrush. Hairs from the neck of Siberian wild boar are attached to bamboo or bone handles.
1600s - Travelers from China bring toothbrushes to Europe. Though the toothbrushes enjoy some popularity, most Westerners still clean their teeth using toothpicks made of silver, copper or goose feathers.
1780 - William Addis of Clerkenwald, England, makes the first mass-produced toothbrush. He attaches hairs from the tail of a cow to the end of a whittled thighbone of a cow.
1880 - "Dr. Scott's Electric Toothbrush" is marketed. Its manufacturer claims the brush is "permanently charged with electro-magnetic current." However, the first real electric toothbrush isn't produced until 1939. An electric toothbrush is first marketed in the United States in 1960.
1885 - Companies begin mass-producing toothbrushes in America.
1937 - DuPont scientist Wallace H. Carothers invents nylon, and a year later, "Dr. West's Miracle Tuft Toothbrush" is introduced with nylon bristles. Unfortunately, the "miracle tuft" nylon is so stiff that is sometimes damages gums.
1941-1945 - Dental hygiene takes a giant leap forward during World War II when the Army orders soldiers to brush their teeth regularly. This marks the first time most Americans brush their teeth.
1950 - A safe, soft nylon bristle finally becomes the standard for toothbrushes.
2001 - A manufacturer in California comes up with a unique idea in response to the rolling blackouts plaguing the state - a toothbrush that doubles as a flashlight. It's one of more than 3,000 types of toothbrushes that have been patented to date worldwide.
作者：Anonymous 在 罕见奇谈 发贴, 来自 http://www.hjclub.org |
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