YouTube really sucks you in! Here is a video on jellyfish. I have a deep fascination with them after I saw a large tank of Moon jellyfish in an aquarium many years ago. They were mesmerizing. Their pulsing forms, grace, effortless movement, how they seemed totally harmless. But obviously they (literally) have a sting in their tails and some are even lethal to man.

Prepare to be hypnotised…