Richard Turere-My invention that made peace with lions

In the Masai community where 13-year-old Richard Turere lives, cattle are all-important. But lion attacks were growing more frequent. In this short, inspiring talk, the young inventor shares the solar-powered solution he designed to safely scare the lions away.

https://www.ted.com/talks/thomas_suarez_a_12_year_old_app_developer Rather than just having an idea and forgetting about it, he went ahead and did it. Do you have any great ideas that you might want to try out?