Isaac newton came up with the idea of who invented gravity.
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History shows that it was an Arabic idea.
The chalkboard was invented by James Pillians, a high school geography teacher in Scotland. He invented in 1801, but it is not know how he came up with the idea, but it was invented to present ideas visually to students.
Isaac Newton came up with the idea. "Many people saw the apple fall, Newton asked why". Bernard Baruch.
Archimedes discovered the concept of gravity with his levers and pulleys, his theory of displacement and invented the screw.
Meter as a unit of length was not invented but introduced in accordance with international convention, in 1875. The idea of introducing the metric system originated in France in the 18th century.