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.
It is not known exactly who invented the wash board. There are some  indications of its use being around as early as 1797. Despite this,  the washboard was not patented unti â¦ l 1833 in the state of New York  by Stephen Rust. Rust typically gets the credit for the invention.