The document lists important inventors and discoveries such as the telescope, braille system, bicycle, television, atomic bomb, ball point pen, battery, email, plastic, printing press, radio, railways, x-rays, film, helicopter, motor scooter, and stethoscope. It asks questions about some of the key inventors and introducers such as James Clerk Maxwell, John Logie Baird, László Bíró, William Coolidge, Emile Reynaud, Igor Sikorsky, and others.