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principle today when designing new ships.

The other story is about Thales. Once, the

Pharaoh was looking for the person to measure

the height of a pyramid. Thales told the Pharaoh

that he only needed a wooden stick and a ruler

to measure the eight of the pyramid. He showed

his method by inserting the stick next to the

pyramid. When the shadow of the stick was as

long as the stick, he measured the length of the

pyramid’s shadow and told the Pharaoh that

the length of the shadow was exactly the same

height of the pyramid.

Thales was really the smartest person in the

world at that time. He efficiently measured the

height of the pyramid by using some simplest

tools and got the answer without climbing up to

the top of the pyramid. This is used today to

measure buildings and even mountains.