"Nikola Tesla, whoever that is"

Oskar's grandmother presents him with a sheet of stamps entitled 'Great American Inventors'; but though he spent much of his career in the United States, Nikola Tesla (1856-1943) was not American. Born in a small village, Smiljan, in what is now Croatia, Tesla was of Serbian origin. He was a prodigious inventor and made many revolutionary contributions to the field of electromagnetism, including pioneering the development of the Alternating Current electricity system.

In 1892 he proposed that messages could be transmitted without wires, and his experiments with transmitting devices earned him recognition as one of the inventors of the radio.