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George Washington's Teeth
American President George Washington’s teeth began to fall out before he reached the age of thirty, and he eventually lost them all. During his life, he had at least four sets of dentures made to replace them. Natural teeth In 1756, when Washington was 24 years old, a dentist pulled his first tooth. According to his diary, he paid 5 shillings (£, ) to a "Doctor Watson" for the removal. His diary also regularly mentioned troubles such as aching teeth and lost teeth. John Adams said that Washington attributed the loss of his teeth to using them to crack walnuts, but modern historians have suggested that mercury(I) chloride (calomel), which Washington was given to treat smallpox, probably contributed to the loss. On April 30, 1789, the day of his first presidential inauguration, although he had mostly dentures, he had only one remaining natural tooth, a premolar. During that same year, he began wearing full dentures. Washington's last tooth was given as a gift and keepsake to hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Comparison Between Athenaeum Portrait And United States One-dollar Bill
Comparison or comparing is the act of evaluating two or more things by determining the relevant, comparable characteristics of each thing, and then determining which characteristics of each are similar to the other, which are different, and to what degree. Where characteristics are different, the differences may then be evaluated to determine which thing is best suited for a particular purpose. The description of similarities and differences found between the two things is also called a comparison. Comparison can take many distinct forms, varying by field: To compare things, they must have characteristics that are similar enough in relevant ways to merit comparison. If two things are too different to compare in a useful way, an attempt to compare them is colloquially referred to in English as "comparing apples and oranges." Comparison is widely used in society, in science and in the arts. General usage Comparison is a natural activity, which even animals engage in when dec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
18th Century In Medicine
18 (eighteen) is the natural number following 17 and preceding 19. In mathematics * Eighteen is a composite number, its divisors being 1, 2, 3, 6 and 9. Three of these divisors (3, 6 and 9) add up to 18, hence 18 is a semiperfect number. Eighteen is the first inverted square-prime of the form ''p''·''q''2. * In base ten, it is a Harshad number. * It is an abundant number, as the sum of its proper divisors is greater than itself (1+2+3+6+9 = 21). It is known to be a solitary number, despite not being coprime to this sum. * It is the number of one-sided pentominoes. * It is the only number where the sum of its written digits in base 10 (1+8 = 9) is equal to half of itself (18/2 = 9). * It is a Fine number. In science Chemistry * Eighteen is the atomic number of argon. * Group 18 of the periodic table is called the noble gases. * The 18-electron rule is a rule of thumb in transition metal chemistry for characterising and predicting the stability of metal comp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
