Question: If you could make one invention that will change the world what would it be?

Robert Dowdall answered on 14 Mar 2017:

The worlds biggest problems over the next 50 years are related to clean safe drinking water, healthy soils to grow enough food and energy.

I would love to develop a way to clean our planets soils so they could produce more healthier food where they are needed. More and more areas of the world are becoming dessert which forces people into starvation.