If you can read this, then I've coexisted with you for more than 14% & less than 15% of your life so far. My English name starts with the letter 'F'. What am I?
What am I?
(So far, and somewhat to my surprise, the original companions & one other person went 0-for-3 without further clue. I bet at least eight of you will get it right away here -- though I really wonder how many!)