watergate
Most screws are made of some metal or another.
Some presidents that served for the United States were Abraham Lincoln, George Washington as well as Barack Obama. These men all made the country a better place.
Some of the Presidents have cheated on their wives like Bill Clinton getting off Mrs. Clinton
One of their biggest obstacles is being an effective communicator. Ensuring that they are never in the same place at the same time as the president, in case of emergency.
Some of the biggest mistakes that have been made by astronauts when in space include the Space Shuttle Challenger Accident in 1986 and the Space Shuttle Columbia disaster in 2003.
The Archimedes screw is typically made of metal, such as steel or aluminum, to withstand the pressure and movement of water or other fluids being transported. It may also be constructed using durable plastics in some applications.
Some Presidents did but some attended private
they baked the largest loaf...and made the biggest knife
They are long srews that go through a fitting. They offer support. Some are made for CNC machines. You can read some more at http://www.techno-isel.com/Tic/LPBallScrew.htm A ball screw in usually made out of hardened steel. It used to make a very fine adjustment on the object that it supports.
Mostly made of steel. Then some are made of stainless steel, titanium, brass, bronze, monel or silicon bronze which are also weather resistant.
Some words that can be made from pneumonoultramicroscopicsilicovolcanoconiosisare:aaceailaimaleallalonealtaralteraluminumamountampleampuleaniseanvilappleAprilareareaartasaspaspireaspirincactuscamcamecamelcancanecantcantercasecastlecatcatercausticcertaincinemacinnamonclapclasscoilcoincomiccomicalconeconicalcopecoppercoralcorncorralcosmeticcosmiccountcoursecrimecronecropcruelcurtainloanmacaronimailmallmealmicroscopicmononewnooasisonopalororaloreovalpiepierpinpinepintpollenroserinserisesiliconesillsisteatietintinetotoptopictopicalultravacationvolcano
There are about 50 presidents. Go to http://www.answers.com/topic/list-of-presidents-of-mexico Some with foreign names.