As a rule of thumb, I would submit that if you need to call your floss provider, for any reason, you are probably not ready for this level of oral hygiene.
Bill BrysonAnyone who has read my books will know that I don't tend to use guides when I am travelling. It's not a pride thing, but it is certainly a fact.
Bill BrysonIt isn't easy to become a fossil. ... Only about one bone in a billion, it is thought, becomes fossilized. If that is so, it means that the complete fossil legacy of all the Americans alive today - that's 270 million people with 206 bones each - will only be about 50 bones, one-quarter of a complete skeleton. That's not to say, of course, that any of these bones will ever actually be found.
Bill Bryson