In a stunning discovery that overturns decades of textbook teaching, researchers have determined that the brain is directly connected to the immune system by vessels previously thought not to exist. The discovery could have profound implications for diseases from autism to Alzheimer's to multiple sclerosis
http://www.sciencedaily.com/releases/2015/06/150601122445.htm
PS: And a trivia question: In which WBF thread will you find transparent cows