Ah right - slightly less than a Borg cube!
Flatworms could hold key to immortality
British researchers believe that the worms, which live in ponds and lakes, could live forever after examining their ability to repeatedly regenerate.
Experts from Nottingham University managed to create a colony of more than 20,000 flatworms from one original by chopping it into pieces and observing each section grow into a new complete worm.
They believe that it could help scientists develop new methods to allow humans to stay younger for longer.
"Our data satisfy one of the predictions about what it would take for an animal to be potentially immortal," Aziz Aboobaker, who led the research.
"The next goals for us are to understand the mechanisms in more detail and to understand more about how you evolve an immortal animal."