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My favourite animal is a cat. It can be white, black, gray, brown and other colour. I like the gray cats with striped fur.

This animal has got four legs and a tail. It is about one half a metre long and it weighs a few kilograms.

When cats are little kittens, they are very playful and funny. Each cat has its own character, but all of them are very careful and clever.

Cats live in cities, villages and in wild nature. They have got sharp claws and are able to climb trees. These animals are predators and eat milk, meat and fish. They are mostly night animals who sleep during the daytime.

Cats are the most popular pets. They are fluffy and very cute. I like cats!

Archimedes. Why in the first place was the ancient Greek scientist? First of all, because he is one of the greatest mathematicians of all times, close he came to the calculation of the number of "PI". Today all students and students of the daily study and enjoy the discoveries of the Greek. Also Archimedes was famous for the invention of many useful machines. Among these are the siege guns, and mirrors, поджигающие sails on the Roman ships by focusing sunlight. Archimedes made the first theorist of mechanics. For example, he presented the complete theory of the lever, applying it in practice. Also, scientists have developed a Archimedes screw (screw), with the help of which вычерпывается water and the present day. The primacy of the inventor of merit - all of it was opened more than two thousand years ago, when there were no computers, no technology available today, the inventors. Archimedes, perhaps, he studied in the libraries of Alexandria, but most of his knowledge was acquired independently.