1455

While maybe not exactly accurate, February 23rd, 1455 is generally accepted as the date that the Gutenberg Bible was first published. This was the first book on record to be printed on movable type. Until that point, books were copied by hand, which was obviously a slow, laborious process.

For further reading, https://en.wikipedia.org/wiki/Gutenberg_Bible

1927

German physicist Werner Heisenberg writes a letter to Wolfgang Pauli, describing the uncertainty principle for the first time. He will submit a paper on the principle for publication the following March.

For further reading, https://en.wikipedia.org/wiki/Werner_Heisenberg

1927

The Radio Act of 1927 is signed into law. The Act creates the Federal Radio Commission (FRC), which will later be replaced by the Federal Communications Commission (FCC). Ironically, the act claims to recognize broadcasters’ right to free speech yet the Federal Radio Commission solely controls allocation of licensing, frequencies, transmitter power, and broadcasting hours. Doesn’t exactly sound like free speech to me, but then, I’m not American.

For further reading, https://en.wikipedia.org/wiki/Federal_Radio_Commission

2005

The discovery of the first mobile phone virus, Cabir, is announced. Specifically, Cabir is a worm that infects phones running the Symbian OS. Whenever an infected phone is activated, the message “Caribe” is displayed. Infected phones also attempt to spread the virus through Bluetooth signals.

For further reading, https://en.wikipedia.org/wiki/Cabir_(computer_worm)