Why are some coins grooved around the edge?
Pennies and nickels have smooth edges, but coins of higher value are milled, or grooved, around the edge. When coins were made of silver and gold, people used to trim the edges and sell the precious metal. The best way to stop this was to mill the edges of the more valuable coins so that trimming would be noticed. This practice continues, even though few coins of precious metal are circulated.

What are blue chip stocks?
Blue chip stocks are common stocks issued by companies with long histories of rising profits and dividends and strong finances. The most famous and most commonly used indicator of blue chip stock performance is the Dow Jones industrial average. The Dow Jones average is compiled by averaging the value of 30 of the largest and most respected blue chip stocks.

What is "cornering the market"?
"Cornering the market" refers to the practice of buying enough of a particular stock to be able to control its price. During the 1800's and early 1900's there were many instances of investors using this strategy. In the United States, the practice was prohibited in 1934 by the Securities Exchange Act.