This last day or two I have had about 10 people in my facebook feed excitedly post a link to an article about how some scientist has "discovered" that if you co

This last day or two I have had about 10 people in my facebook feed excitedly post a link to an article about how some scientist has "discovered" that if you cook a potato you can power a led lightbulb off it for 40 days. And then going on about how this is wonderful for the 3rd world because they can grow their own potatoes instead of us having to ship expensive polluting batteries to them. When I point out that the potato is irrelevant and the power is being generated by using up the zinc electrode and if you are going to ship them zinc electrodes for this it's no different to shipping very old, very poor batteries I just get told off for being so negative and how "I'm sure they've thought of that". Ugh.