It was invented by Alexander Graham Bell - Telephone , Before this invention came, humans were limited in transportation. It was invented by the Mesopotamians - The wheel, Before this invention, trade was the commercial exchange of goods and services. Precious metals, coins, foods, vegetables, livestock, were used. - Money!, The spread of knowledge and historical records reached an unprecedented pace, this was invented by Johannes Gutenberg. - Printed press, This invention was patented by James Watt, it started the Industrial Revolution. - Steam engine, This invention was used by scientist to start the war against bacteria - Antibiotics, This has been used to keep historical records from generation to generation - Paper, Ice and snow were being used before this invention to preserve food. - Refrigerator, The ideas of a scientist that have been offering an explanation of how espieces have changed - Theory of Evolution, This machine was invented to perform generic sets of operations - The computer,

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