I remember when I was little I was in the water and I felt something touching my back. I thought it was my cousin. After a while I turned around and saw a jellyfish. I was very scared and I saved myself as soon as possible and then hundreds of jellyfish appeared in the water. Fortunately she had not stung me. It was in Brittany. In any case thank you for your advice which will be very useful for all those who will bathe this summer. I will follow you because your blog is interesting and I love science