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The Egyptians invented the first calendar.

This occurred in 4241BC, the first year events were precisely dated.

The Babylonians invented the abacus.

The abacus, the first adding machine, was invented in 3000BC.

Coins were first used in Lydia (Turkey).

This occurred in 700BC.

The first mechanical clock was invented by a monk.

The year was 999.

The first pair of glasses were made in Italy.

The year was 1280.

The printing press was invented by Johannes Gutenberg. 

This occurred in the 1450s.  Guttenberg's printing press revolutionize the production of books.  This, in turn, speeds up the spread of information about new inventions.

The toilet was invented by Joseph Bramah.

The year was 1778.  Household sanitation was greatly improved with this invention.

The sewing machine was invented  by a French tailor named Thimonnier.

The year was 1830.

The first helicopter was built by a Russian engineer named Igor Sirkorsky.

The year was 1939.

An American inventor named Percy Spencer patents his design for the first microwave oven.

The year was 1945.

The Babylonians invented the abacus.

The abacus, the first adding machine, was invented in 3000Bc.