Not everything you see on the net is true. But this video is!
Okay, it’s in Japanese, but basically what it says is: if you take old coffee and add a bit of salt, it will taste fresh again. It’s true! I took a french press of coffee that had been sitting around most of the day, added some water to thin the coffee out, added a little tiny bit of salt, microwaved it, and hey – good coffee again. Yay! 🙂