April 3, 1973 — First Cell Phone Call
Martin Cooper, an American engineer who led the Motorola team that developed the first cellular phone, made the first public cell phone call on a New York City Street. The product wasn't brought to market until 1983. A pioneer and visionary in the wireless communications industry, he was awarded the Marconi Prize in 2013.
April 13, 1970 — Apollo 13 Explosion
After an oxygen tank aboard the Service Module of Apollo 13 exploded, astronaut Jack Swigert proclaims the now famous quote "Houston, we've had a problem here.