Mit der 3b auf Ehrengräberführung am Wiener Zentralfriedho! “We got a lot of information about the cemetery and people buried there. We saw some famous graves like Ludwig van Beethoven and the one and only Hedy Lamarr. She was a famous Hollywood actress and inventor born in Vienna. She invented ‘frequency hopping’ in 1940. We have Bluetooth and Wi-Fi today because of it. But her invention was not appreciated until decades later.” -Marco, 3b