Saturday, July 31, 2010

Denim Jeans

Denim jeans date back to over 500 years ago, they were first used by the navy in Genoa, Italy. The most popular brand, Levis was patented in 1873 by Levi Strauss, and Jacob Davis, they received a patent for “an improvement in Fastening Pocket-Openings”, the patent was for the familiar metal rivets.

Friday, July 30, 2010

Aerosol spray paint nozzle

A man named Edward Seymour invented spray paint in 1949. He added paint to the existing aerosol can technology, as suggested by his wife. He designed this paint delivery system to demonstrate his aluminum paint, this system was instantly popular. Seymour of Sycamore, Inc. still produces aerosol spray paints to this day. Most Aerosol paints also have a metal, glass or plastic ball inside of the can, to mix the paint. One unfortunate side effect of this invention is Graffiti, which started to become a problem in the late 1970s. The national annual estimate for the cost of graffiti cleanup is between $1 and $3 per person.

Thursday, July 29, 2010

The woodlouse spider

Dysdera crocata is nocturnal and is called the woodlouse spider because it actively hunts them. It is usually found under wood or bark and prefers to hide in sheltered, damp, ground habitats like those provided by logs or rocks, and is sometimes found in urban gardens under old bricks or paving. These spiders do not build webs, however the female will build a silken sack where it will molt and lay eggs, and stay with its offspring until they are ready to leave the nest. Bites by the woodlouse spider are not dangerous, however they can be painful, since their fangs are capable of penetrating the exoskeletons of a wood louse (pill bug, sow bug) they will have no problem penetrating your skin. They are commonly mistaken for the very dangerous brown recluse spider.