Useful Inventions

Those who discovered useful inventions get the credit for doing the experiments required to produce valuable results.

The Earth is thought to be 4.5 billion years old. The oldest fossils of Homo erectus are dated at 1.8 billion BC.

Dinosaur extinction believed to be 65 million BC.

Stone tools were used around 2.6 million BC

Man using fire is dated around 400 thousand BC.

Human migration began around 60 thousand BC

Migration across the globe was dated at 40 thousand BC.

Agriculture began around 20 thousand BC

The Ice Age ended around 11 thousand BC.

Agriculture became wide spread after 10 thousand BC

Dugout Boats were dated at 10 thousand BC

Large stone construction is dated to 9000 BC

Smelting ore began around 5500 BC

Copper was discovered around 3500 BC

Bronze was discovered around 3000 BC

Iron was discovered around 1200 BC

Steel was produced around 600 BC

From 600 BC to 600 AD, trade routes expanded using ocean-going vessels.

From 600 AD to 1450 AD, the “known world” consisted of Europe, Africa and Asia. Chinese invented gun powder around 900 AD.

From 1450 AD to 1750 AD, the “known world” expanded to include the American continent and caused European explorers to cover the Pacific Ocean. Inventions in the 1500s included the telescope, eyeglasses, the microscope and the printing press.

From 1750 AD to 1900 AD, was the age of rapid development and the use of applied science to harvest the inventions we discovered since 1450 to be put into daily use.

The place and time most of our useful inventions were developed to be put to use was between 1750 and 1900 in the US and Britain. Scientists had been experimenting with everything since the 1400s. These were experiments in physics and chemistry and they continued through the 1800s.

From 1900 AD to 2020 AD was the age of rapid deployment and further development of applied science-based inventions. The microscope was not fully in use in medicine until 1900.

Norb Leahy, Dunwoody GA Tea Party Leader