The many rules of thumb that are available to compare cat ages to human ages are usually based upon total life expectancy. An average catâs life expectancy is around 17 years, and a humanâs is around 84 years.This leads to a rough equivalency of five-to-one. But it is not an apples-to-apples comparison.onventional wisdom holds that each year for a cat is equivalent to seven years of development and aging for a person. Or that each cat year is equivalent to five human years. Or that the first two years are equivalent to 21 years, and each subsequent year is equivalent to four or five years.
The Cast Iron Plow. A bill has recently passed the Senate of the United States, and is now pending in the House of Representatives, to extend the patent of Jethro Wood for seven years, which he obtained in 1814, and renewed in 1819, claiming to have invented the cast iron Plowshare.
Facts And Figures. 1  The first electric steam iron was patented in the U.S. by Swiss inventor Otto Walker in December 1924. 2  Modern ironing boards and pads are designed to work with your iron, enhancing its performance. 3  A wall-mounted ironing-board hanger and steam-iron rest lets you put your iron away while still hot. As you iron, heat is absorbed by the material you're ironing, as well as the ironing board itself. Steam irons are available with up to 2,300 watts of power, but some would argue that 1,500 watts is all you need.