A crystalline substance created by Danish scientists can evidently absorb large amounts of oxygen from its environment which can then be released by minute amounts of heat, low oxygen pressure (a vacuum), perhaps even with light.
"This could be valuable for lung patients who today must carry heavy oxygen tanks with them," said professor Christine McKenzie of the University of Southern Denmark, in a statement. "But also divers may one day be able to leave the oxygen tanks at home and instead get oxygen from this material as it "filters" and concentrates oxygen from surrounding air or water. A few grains contain enough oxygen for one breath, and as the material can absorb oxygen from the water around the diver and supply the diver with it, the diver will not need to bring more than these few grains."
While this is an amazing invention, I still don't know why they didn't fashion it into the form of a suppository.