What is " banana hacks"?

1) What is " banana hacks"?
2) Should "keep my bananas yellower" be "keep my bananas from becoming yellower"? The latter is redundant. But is the former proper English?

Context:

Update! Readers weighed in with a few banana hacks of their own, and we tried them out. Check out those results here.

For the past week, I’ve been channeling my inner Bill Nye (anyone?) and conducting a little experiment in my kitchen. The objective: to find a way to keep my bananas yellower (or, even better, greener) for longer.

The backstory: My house is one of those hot, sad places this time of year that doesn’t have air conditioning, so fruits and veggies left out on the counter turn ripe—and then, overripe—like, overnight. It would all be fine and well if I wanted to eat eight bananas in a sitting, but since my banana intake is exactly one per day—in my morning oatmeal, with walnuts, cinnamon and honey, if you were wondering—I needed to find a way to make them last longer.



Read more at http://www.phillymag.com/be-well-philly/2013/07/23/bananas-turning-brown/#xIl4G5GZVfIGc67Y.99