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what do I know?

"Eureka!" is Greek for"I have found it!"and it is used when we find a solution to a complex problem. But do you know the story behind "Eureka"? This is one of them.

It dates back to the time of ancient Greece and an inventor named Archimedes.

King Heiro II of Syracuse gave Archimedes a difficult problem to solve: he wanted to know goldsmiths had used pure gold to make his crown. But how could he know that?

One day, Archimedes stepped into a bathtub.He realized that the water flowed over the top of the tub, displaced by his body.Archimedes climbed in and out of the bath,and carefully studied the displaced water.

Read the text about the origin of the expression"Eureka"and answer. a. How old is this story?

b. What was Archimedes asked to solve?

c. What did he find out? How?

Eureka, the word of discovery

He noticed that the more his body sank into the water, the more water he displaced. This meant that the displaced water measured his volume exactly.

He knew that gold is heavier than silver. So,he thought that a crown mixed with silver would be bulkier than one made only of gold,if both weighed the same. Therefore, it would of pure gold.

Archimedes became so excited by this finding that he jumped out of the bath and ran naked through the city streets, shouting:"Eureka! Eureka!".

English, V. 0. A. L. (2016, September 17). Eureka! A word of discovery. VOA. Retrieved December 22, 2021, from: https://bit.ly/32tAAVf

If you want to know more about Archimedes' contributions, visit the following link: https://bit.ly/3Fpg3z0

Look at the pictures, read the information and write sentences in the past tense. Use the words ago, before and the correct tense of the verb invent.

Archimedes' screw. Archimedes.Greece, around 250 B.C.

Compass. China, between the 9th and 11 th century.

Printing press. Johannes Gutenberg.Germany, around 1440.







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UNIT 2· Discoveries • WHAT DO I KNOW?