have you ever invented anything that was a benefit to the public?

Question: have you ever invented anything that was a benefit to the public?
- Keywords:
  benefit,
  public
Asked by Aoife😃😎😋 to Kevin, Dominic, James, Jenny, Norah on 10 Mar 2017. This question was also asked by Ruhao yang.
- Kevin Hayes answered on 10 Mar 2017:
  
  The most recent satellite I worked on was a satellite called Angosat that will be launched later this year.
  
  Angosat’s mission is to provide internet to Angola which will help people who live there keep in contact with their friends and family who may live in other parts of the world.

Question: have you ever invented anything that was a benefit to the public?