And a kittenâs teeth first come in between two to four weeks; their more permanent set appears at around four months of age. So if you open a catâs mouth and find permanent, white teeth, the feline is likely to be around a year old. popular misconception is that cats age seven years (in human years) for each calendar year. In fact, feline aging is much more rapid during the first two years of life.
Sarah Boone (1832-1904) was an African American inventor who on April 26, 1892, obtained United States patent rights for her improvements to the ironing board.
In1866, Hiram Maxim, who designed the machine gun bearing his name, applied for and obtained the first of many patents at age 26 for a hair-curling iron. Four years later in 1890 two Frenchmen, Maurice Lentheric and Marcel Grateau, used hot-air drying and heated curling tongs to make deep, long-lasting Marcel waves.