By using at least 3 trials and replication in a scientific investigation, the evidence in your experiment is more accurate and holds less flaws.
A heavy steel or iron block with a flat top, concave sides, and typically a pointed end, on which metal can be hammered and shaped.
Before the cotton gin, production of cotton was slow because the fibers and seeds were separated by hand. The cotton gin was an invention which separated the seeds from cotton making it faster.
After the war, Eisenhower<span> served as Army Chief of Staff then became president of Columbia University. In 1951–1952, he served as the first Supreme Commander of NATO. His administration provided important</span><span> aid to help the French fight the Vietnamese Communists in the First Indochina War.</span>
