As it was a bit of a scorcher yesterday, I took a stroll down by the local river in the evening and walked in the cool shade of the trees. Birds and flowers and boys debating whether to jump into the river from the weir were all par for the course, but one thing I'd never seen in the park before was what looked like cotton fluff on the undergrowth, the ground and the trees in one section. Should it have been there? Was a deadly outbreak of some kind spreading through the park? Is the safety of our planet at stake? Enquiring minds want to know!