[jon_bondy (OP)]

Jon  asked the Naked Scientists:
   I'm listening to older shows [nofollow].

The one about taking water through the rectum puzzled me.  One expert said that the fresh water was not salty enough; the other made use of an osmotic argument and said that salt water was not fresh enough.  Since water will tend to pass through a semi permeable membrane to dilute the saltier side, it would seem to me that fresh water would certainly work.  The two arguments seemed at odds with each other.

Jon
What do you think?