Google's logo on its web search homepage has taken the form of an electromagnetic wave having Google's trademark colours red, yellow, blue and green through which it is paying tribute to German physicist Heinrich Rudolf Hertz on his 155th birth anniversary.
Hertz, who was the first person to broadcast as well as receive radio waves, was born on 22nd February, 1857 at Hamburg. This initiative of the physicist led to the development of television, radio and radar.
The unit of radio wave frequency (which is the number of total cycles per second) has been named as hertz. A lunar crater located on the dark side of the Moon has been named after this physicist.
The first Google Doodle appeared on 30th August 1998 and till this latest Hertz doodle the company posted 1308 doodles on their search homepage.