Here’s an interesting one, from the 12 June 2011 edition of The Telegraph:
“It is a mysterious sound on the very edge of perception that has driven thousands of people around the world to distraction. “
You can read the details here: “Tiny village is latest victim of the ‘The hum’,” by Richard Alleyne.
Based on the Engineering Thinking principles presented previously in this blog, if you were assigned to select the most probable cause of the hum from the following list, which would you choose?