To stay with last week's theme, another photo taken at the Duxford Imperial War Museum in April 2012. Blackouts happened during WWII because of air raids and not just in Great Britain, other countries on the mainland had blackouts too. The main reason of course being that when everything is dark, you can't see what you're bombing, even on a clear night. Even a sliver of light was enough to show habitation and cause potential devastation.
Blackouts today are mostly caused by power failures and tend to produce a lot of children nine months after, especially if it was a long blackout!
This is the letter B for ABC Wednesday. Why not join?