4 ms·
Looks like it's alive and well to me. The "Old Friends" hypothesis by Rook mentioned in the article appears to be from 2003. http://en.wikipedia.org/wiki/Hygie
by ambler0 12y ago
Looks like it's alive and well to me. The "Old Friends" hypothesis by Rook mentioned in the article appears to be from 2003.
http://en.wikipedia.org/wiki/Hygiene_hypothesis http://en.wikipedia.org/wiki/Hygiene_hypothesis