The Mesopotamians were the first to develop a system of astronomy based on the observation of the stars and planets.

The Egyptian solar calendar was a 365-day calendar that was based on the annual cycle of the sun.

The Greeks were the first to develop a system of mathematics that was based on logic and reason.

Pythagoras was a Greek mathematician who is best known for the Pythagorean theorem, which states that in a right triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides.

The Romans were the first to develop a system of engineering that was based on the use of concrete and arches.

The Aqueduct of Claudius was a Roman aqueduct that brought water to the city of Rome from a distance of 40 miles.

The Greeks were the first to develop a system of medicine that was based on the study of the human body.

Hippocrates was a Greek physician who is considered the father of modern medicine. He is best known for his oath, which is still taken by doctors today.

The Greeks were the first to develop a system of philosophy that was based on reason and logic.

Socrates was a Greek philosopher who is considered the father of Western philosophy. He is best known for his method of questioning, which is still used by philosophers today.

The Greeks were the first to develop a system of art and literature that was based on the study of the human form and the natural world.

Homer was a Greek poet who is considered the father of Western literature. He is best known for his epic poems the Iliad and the Odyssey.

The Greeks were the first to develop a system of music and theater that was based on the study of the human voice and the natural world.

Aeschylus was a Greek playwright who is considered the father of Western drama. He is best known for his tragedies, such as the Oresteia.

The Greeks were the first to develop a system of sports and games that was based on the study of the human body and the natural world.

The Olympic Games were a Greek athletic competition that was held every four years. They were first held in 776 BC and are still held today.