A clever way to provide life-saving oxygen
Pneumonia kills about 1.4 million children under five every year.
Treatment with concentrated oxygen could save many of them, but the machines that make it need a constant supply of electricity.
So scientists came up with a clever way to keep oxygen flowing even when the power cuts out.
A video for People Fixing the World by Craig Langran, with filming by Peter Casamento and animation by Rebecca Hendin.