You can yo-yo in space. In 2012, NASA astronaut Don Pettit took a yo-yo on board the International Space Station and demonstrated several tricks. It works because a yo-yo mainly relies on the laws of conservation of angular momentum to perform tricks, which, provided you keep the string taut, apply in microgravity too.

NovaRift

Not only plants photosynthesise. Algae (which are not plants) and some other organisms – including sea slugs and pea aphids – contain chlorophyll and can also take sunlight and turn it into an energy source.