Why do flies

Less than one minute read time.
Can some clever person please explain to me how flies manage to negotiate a way into my house from the lean too to the front room, but can't find their way back out? And why when they bounce off my mirror or the window - don't they get concussion. If I whacked my head on a window like that I'd have a headache!. Oh well it keeps Poppy entertained. OK this is not todays blog, that will come later - but just on tinternet and a fly is bugging me - and I think I am losing whats left of the plot lol Oh to the shots for supplies and maybe tiles and grout - hehe
Anonymous