How to make things ripe

I just learned a new trick :) 

Do you know that you can speed up the ripening process of your veggies with an apple?

Take the green tomatoes or avocado or whatever you need to grow up and get juicy and put it in a paper bag with a ripe apple. I don't know the chemical aspects of the whole process but what's important is that it works. You will get eatable veggies in a day or two instead of waiting the whole week. We all love our apples.