Stool bank: Researchers suggest that we should all make a trip to the poop bank when we're young and healthy and leave a stinky sample of our gut microbiota, which we may need to "withdraw" for use later in life. It could come in handy if you ever need a faecal transplant, which you might, given that the researchers also say they could potentially be used to treat a whole host of diseases. "Conceptually, the idea of stool banking is similar to when parents bank their baby's cord blood for possible future use.
Robo-fish: Scientists have developed 13-millimetre artificial fish which can tow 5kg of material, heal themselves, and collect microplastics from the sea as they swim. The bionic fish can adsorb nearby free-floating bits of microplastics because the organic dyes, antibiotics, and heavy metals in the microplastics have strong chemical bonds and electrostatic interactions with the fish's materials. That makes them cling on to its surface, so the fish can collect and remove microplastics from the water.