If this is the kind of research that Microsoft puts out, then I have an even lower opinion of them than I did before.
from the article
Random vibrations make it impossible to balance the ball on the knife edge, but if the ball is positioned randomly, random vibrations are as likely to keep it from falling as to cause it to fall.
I have a hard time believing that there is a 50 percent chance that a ball will balance on the edge of the knife. First she says it's impossible, then in the same sentence she states that it is just as likely. WTF!