"What Do You Believe Is True Even Though You Can't Prove It?" For its 2005 "World Question," Edge.org invited a "who's who of third culture scientists and science-minded thinkers" to respond to the following: "Great minds can sometimes guess the truth before they have either the evidence or arguments for it (Diderot called it having the "esprit de divination"). What do you believe is true even though you cannot prove it?" They received 118 responses, some of which are also excerpted here. (See also 2003, 2002 discussions).