People are being asked to look out for aeroplane trails, or contrails, which may be contributing to climate change and which can only be recorded by the human eye.
Researchers are also urging schoolchildren to blow bubbles to measure wind speed. --- London Telegraph
"Well, I'm off, dear."
"Where to, love?"
"Doing some climate work."
"Blowing vapor trails and looking at bubbles."
"Smoking at the pub with a Guinness again, are we?"
"Oh, damn. Sorry. Got that backwards."
"Likely story. Then where's your camera?"
"For recording the vapor trails."
"Won't work. The Met says vapor trails can only be recorded by the human eye."
"Do I look stupid?"
"No, love, just British."