Win 1 of 20 Copies of The Book 'They Cannot Take The Sky' from The Lifted Brow

From the Facebook page:

All you need to do win a copy of this remarkable book is to tell us, in the comment section below, about a time when a stranger helped you.
Any story at all is okay, big or small – just tell us about that particular moment. We'd love to hear it.

There is one comment so far (which has been selected as a winner), so 19 more copies up for grabs. No closing date listed, so I'll put it as a couple of days from the post date