Perhaps you're familiar with formaldehyde in this specific — if not morbid — context. If not, you surely remember it from biology class. It's that chemical used to preserve specimens. It has been for centuries
Efforts to figure out the Earth's age go back many centuries. The classical Greek philosopher Aristotle, who thought time had no beginning or end, also believed that Earth was infinitely old. Meanwhile, religious scholars in ancient India, who envisioned a universe that perpetually exploded, expan...
For centuries, people wondered how big the Earth was. Unfortunately, although the Earth was flat, no one was able to figure out its size. Gradually, however, people began to realize that the Earth was really round.Then, in the third century BC(2,300 years ago), a Greek man named Erato...
Actually, The true size of the Earth is 25,000miles (40,000 kilometers ).Eratosthenes's measurement was wrong, but it was very close to the truth.For many centuries after Eratosthenes lived, people made maps of the Earth. However,they did not know very much about the world outside of ...
Over the centuries, our view of light has changed dramatically. The first real theories about light came from the ancient Greeks. Many of these theories sought to describe light as a ray -- a straight line moving from one point to another. Pythagoras, best known for the theorem of the rig...
Early cultures used meteorites to craft weapons and jewelry long before anyone knew how to extract iron from ore.
To know them better, let’s take a look at how maps have changed over the centuries. Many ancient countries used maps. One of the first is thought to have been drawn on the wall in Lascaux, France, around 16,500 years ago. Hi...
Visual depictions of statistical data have a deep history, going back at least to 1644, when the Dutch astronomer Michael Florent van Langren created a graph showing different estimates of the distance in longitude between Rome and Toledo, Spain. Over the centuries, mathematicians and scientists ha...
Economists have never had a consistent definition of "entrepreneur" or "entrepreneurship" (the word "entrepreneur" comes from the French verbentreprendre, meaning "to undertake"). Though the concept of an entrepreneur existed and was known for centuries, the classical andneoclassical economistsleft ent...
【题目】完形填空For centuries, people wondered how big the Earth was. As long as they thought the Earth was 21, no one could figure out its size. However, people began to 22 that the Earth was really round.Then. 2300 years ago. a Greek man named Eratosthenes had an 23. Eratosthenes ...