The Native American interpreter Sacajawea was a valuable member of the Lewis and dark expedition in 1805.

Formerly , in the United States, many nurses worked as private duty nurses rather than in hospitals.

HowmanypeopleareawarethatadancerwiththeNewYorkCityBallettypicallywearsoutaminimumoftwohundredpairsoftoeshoesperyear?

In 1974 Henry Aaron broke Babe Ruth's monumental lifetime record of 714 home runs.

Although the Carbon 14 method of dating old objects is not foolproof , it is the best method available at present