Cretaceous Chirality Conjecture

Who says the white coat boys don't have a sense of humor? A recent scholarly paper, written by a chemist at Columbia for the Journal of the American Chemical Society, ended thus:

An 
implication
 from
 this 
work 
is 
that 
elsewhere 
in
 the 
universe
 there 
could 
be 
life
 forms 
based 
on 
D 
amino
 acids 
and 
L
 sugars, 
depending 
on
 the 
chirality 
of 
circular
 polarized
 light 
in 
that 
sector 
of 
the 
universe or 
whatever 
other
 process 
operated 
to
 favor
 the 
L
α‐methyl 
amino acids 
in 
the 
meteorites 
that 
have 
landed 
on Earth.

 Such
 life
 forms
 could
 well
 be
 advanced
 versions
 of
 dinosaurs,
 if
 mammals
 did
 not
 have the
 good 
fortune
 to 
have 
the 
dinosaurs 
wiped
 out 
by 
an 
asteroidal 
collision, 
as 
on
 Earth. 

We 
would 
be 
better 
off 
not 
meeting 
them.

Indeed. Can you imagine the engineering and power requirements for boosting a brontosaurus out of a gravity well?