I don't usually think much about green beans until the gorgeous yellow wax beans appear in my local farmers market. Although the yellow and green specimens are in separate bins, I love buying some of each and steaming them together for a simple vegetable side dish or a refreshingly crunchy summer salad.
When I was a kid, we called green beans string beans, but as far as I can tell, the strings have been hybridized out of the ones I encounter. Next time I'm at the market, I'm planning to ask the farmer, "Whatever happened to those strings?" I'm sure the answer is available on the internet, but I'd rather find out the old-fashioned way.