Milestones and Inventions

All of the following happened on today’s date, 3 April.

1. On this day in 1860, the Pony Express mail delivery system was launched in the US. How long did the service operate?
   • 18 months
   • 32 months
   • 53 months
2. On 3 April 1981, the first successful handheld portable computer was sold. By what name was it known?
   • Osborne 1
   • Page 1
   • Cooper 1
3. In aviation, in what year did the first flight over Mount Everest take place?
   • 1927
   • 1933
   • 1939
4. What city which had been liberated from the Ottoman Empire by Russian troops was named the capital of Bulgaria on 3 April 1879?
   • Bucharest
   • Sofia
   • Zagreb
5. On this date in what year was the first handheld mobile telephone call made?
   • 1973
   • 1981
   • 1988

Good luck! I will post the answers later today.