Riddle
 
I can
travel
at
nearly
100
miles per hour,
 
but
never
leave
 
the
room.
 
You can
cover
me
up,
 
but
 
that
does not
slow
me
down.
 
You
will not
know
if
I
come
only
once
 
or
again and again
 
and
again.
 
What
am I?
 
A
sneeze