What technology you can show/explain to your granny in order to marvel her?


I was thinking about this question a year ago.

For example:

  • contact lenses were created at the 60s
  • Computers, the Internet were created 30 years ago
  • Space rockets? sister of my granny was born at April 61, so they aware about Gagarin flight

Another question is how to simply to explain those technologies.
What I show are Boston Dynamics progress(not just Atlas flips) and Falcon Heavy first launch.