2 ideas from SciShow, each explained in a minute and credited to the original work. Free on Savvy.
SciShow explains how the immortal jellyfish, Turritopsis dohrnii, can revert to an earlier life stage when stressed or injured, and what that trick can and can't actually do for it…
— SciShow, How to Live Forever? Be a Jellyfish
Tardigrades can dry themselves into a near-lifeless 'tun' state, tolerating radiation, extreme cold and the vacuum of space, then rehydrate and carry on as if nothing happened.
— SciShow, Tardigrades: Adorable Extremophiles