1. Did physics play a very important part in the first half of the 20th century?
2. Do the physicists or chemists have to solve many vital problems?
3. Who had to use things given by nature?
4. How many long periods in the history of human progress, named after the basic material used do we know?
5. Today scientists and engineers can produce almost any kind of materials, can't they?
1. Did physics play a very important part in the first half of the 20th century?
2. Do the physicists or chemists have to solve many vital problems?
3. Who had to use things given by nature?
4. How many long periods in the history of human progress, named after the basic material used do we know?
5. Today scientists and engineers can produce almost any kind of materials, can't they?