Heart attacks are frightening by themselves, but they're made worse by the potential for lasting damage. Even a brief interruption to blood flow could permanently destroy vital tissue that keeps your heart beating as usual. However, there might be a way to mitigate or even prevent that damage. Scientists have discovered that a light-sensitive bacteria, synechococcus elongatus, can keep oxygen coming in the midst of a heart attack. Much like a plant, the bacteria both draws on photosynthesis for energy and turns both CO2 and water into oxygen. If you expose it to light soon after the attack, you can maintain oxygen levels and increase the heart's blood-pumping ability after the attack is over.