Science inventions

ed cars?
What have you already heard about it?
Примерные ответы студентов:
Dialogue1
A: What new facts have you learned about telegraph, telephone and computer?
B: I have learned that in 1837 two English scientists sent a message by electric telegraph for a distance of more than 1,6 kilometers. Ive learned that one day A. G. Bell spilled some acid on himself, called T. Watson and his voice was coming through a wire to a receiver. I also have learned that the first calculating machine was invented in 1812 by Ch. Babbage.
A: What have you already heard about them?
B: Ive already heard that Alexander Graham Bell invented telephone. Ive already heard that S. Morse, experimenting with an electric telegraph invented a code that used dots and dashes for the letters of the alphabet. Ive already heard that computers can control machines at factories, work out tomorrows weather.
Dialogue2
A: What new facts have you learned about artificial heart, keyhole surgery and laser?
B: Ive learned that the first artificial heart was implanted at Tel Aviv hospital. Ive learned that surgeons have found ways to remove kidneys and gallbladders by using just one or two puncture holes in the tummy. I have learned that the name "Laser" stands for light amplification by stimulated emission of radiation.
A: What have you already heard about it?
B: Ive heard that artificial heart hadnt been tested on humans before it was implanted in Israel. Ive heard that ear, nose and throat surgeons have been performing keyhole surgery for years. Also Ive heard that laser, when focused, can vaporize any substance on earth.
Dialogue 3
A: What new facts have you learned about solar-powered lamps and solar-powered cars?
B: Ive