Underlying aerodynamics and all other branches of theoretical mechanics are the laws of motion who were developed in the seventeeth century.

A mortgage enables a person to buy property without paying for it outright; thus more people are able to enjoy to own a house.

Talc, a soft mineral with a variety of uses, sold is in slabs or in powdered form.

During the 1870s, iron workers in Alabama proved they could produce iron by burning iron ore with coke, instead than with charcoal.

Written to be performed on a ..........................., Thomton Wilder's play Our Town depicts life in a small New England community.

The first explorer ..................... California by land was Jedediah Strong Smith, a trapper who crossed th southwestern deserts of the United States in 1826.

Margaret Mead studied many different cultures and she was one of the first anthropologists to photograph hers subjects

Alaska found the first years of its statehood costly because it had to take over the expense of services .................... previously by the federal government.

.......................... many copper mines in the state of Arizona, a fact which contributes significantly to the state's economy.

With age, the mineral content of human bones decreases, ......... them more fragile.