Biology Lab Safety Rules. Biology lab safety rules are guidelines designed to help keep you safe when experimenting. Some equipment and chemicals in a biology laboratory can cause serious harm. It is always wise to follow all lab safety rules. Don't forget, the most helpful safety rule is to use plain old common sense.
In 1937 statehood for Hawaii was proposed and refused by the U.S. Congressâthe territory's mixed population and distance from the U.S. mainland were among the obstacles. On Dec. 7, 1941, Japanese aircraft made a surprise attack on Pearl Harbor, plunging the United States into World War II.
In the summer of 1898, the United States fought Spain in one of the shortest and most pathetically one-sided wars in modern history. The war represented a powerful resurgence of the same doctrine of Manifest Destiny that had led the United States to expand westward by defeating Mexico in 1846-48.