How to ripen bananas in a day?

Most often, the bananas sold in Unites states are green. I like just ripened bananas with few occasional brown spots. They taste so much better. Next time you buy a bunch of green bananas, also buy an apple. Put the apple along with the bananas in a brown paper bag and fold the opening to close the bag. The apples continuously give out ethylene gas. Ethylene gas will ripen the bananas in about a day. Yes! you can also eat the apple. The apple remains un-affected.

If you don't have an apple, use an old ripened banana.