HEALTH

JELLYFISH AGE BACKWARDS: NATURE’S SECRETS TO LONGEVITY 

by Nicklas Brendborg (Hodder £16.99, 320pp)

There are many myths about people who find the fountain of eternal youth, but we know they’re just that: myths.

In nature, however, there’s a tiny jellyfish called Turritopsis, no larger than your fingernail, that does something quite miraculous.

When stressed by hunger or a sudden change in water temperature, it can revert to its young polyp stage and start its life all over again,…