What one activity/skill would you have people attempt to make the world a better place?

And in what way would it make the world a better place? (And what’s your own experience of said activity/skill?)

For example, I’ve just started a cross-stitch, the first one in my life… (I’m loving it!!) I have so far spent about 6 hours on it, and the area covered is little more than the size of my index finger! If more people attempted to do a cross-stitch, there would be a greater appreciation in the world for the effort involved in all the rich tapestries created throughout history… And, erm, as a result people would be more greatly appreciating their heritage, and that’s a very important thing!

Your turn!