Re: smallest ANCIENT non-bird dinosaur - was what I was asking

[Mike Taylor <mike@indexdata.com>]

T. Michael Keesey writes:
 > >  > I read in one book that if you go back 1600 (not 1000) years,
 > >  > everyone from that time who has living descendants is
 > >  > ancestral to everyone alive today.
 > >
 > > Er.  Isn't that tautologously true?
 > 
 > No, a dead person can have living descendants without being
 > ancestral the the entire extant world population. (E.g., say,
 > Charles Darwin.)

Oh!  You mean _each individual_ from when who has any descendants at
all is ancestral to _all_ of us?  Wow.  That _is_ weird.  So we only
have to go back 64 generations or so before we're all related
(assuming 25 years per generation).

 _/|_    ___________________________________________________________________
/o ) \/  Mike Taylor    <mike@indexdata.com>    http://www.miketaylor.org.uk
)_v__/\  "Truth is absolute, there is no such thing as half of one" --
         Harvey Thompson.