Researchers at the Children’s Hospital Boston have created oxygen-carrying microparticles that can be injected into the vein and could (theoretically) mean that someone could live without breathing or being ventilated. It’s only been tested in animals so far but it restored oxygen levels to normal within seconds. Like Harry Potter’s gillyweed, it would only be temporary but could buy time for doctors and paramedics.

Read the paper in Science Translational Medicine.