1) Lightning strikes the Earth about 8 million times a day.

2) The Russian Revolution in 1917 resulted in the overthrow of the monarchy and the establishment of a communist government under Vladimir Lenin.

3) The naming of cyclones varies depending on the region. For example, cyclones in the Atlantic and eastern Pacific Ocean are named using a predetermined list of names.

4) The first smartphone, the IBM Simon, was introduced in 1992 and featured a touchscreen, email capabilities, and apps such as a calendar and calculator.