We know almost nothing for certain about their language, customs or spiritual beliefs – and we probably never will.
One common parental complaint is that a tutor seems almost expected for certain classes, like Riverdale's Integrated Liberal Studies and Constructing America.
It also claims that it in its testing so far, engagement rates have been consistently high, "ranging from an average of 12% to almost 40% for certain high profile celebrities".
The association with one of golf's most famous tournaments has an almost irresistible pull for certain businesses.
But there are times now when his eyes soften into an almost paternal affection for certain players, the way a predecessor at United, Matt Busby, used to be.
But almost nothing can be said for certain about her whereabouts since March 2003, when she was last seen getting into a taxi with her three children in Pakistan's biggest city, Karachi.
One thing is for certain: almost every major electronics OEM will probably jump in the Android Wear pool in time for the holidays, if only for fear of being left behind in this new market.
"Unfortunately it has become almost a universal occurrence for certain law firms to file lawsuits of this type around any corporate (mergers and acquisitions) activity," said John Ambler of Burlington Northern, who declined to comment on the specifics of the litigation.
"When you take a mentally ill person from New York to rural Texas, you're basically setting them up for almost certain deportation".
He's still heading for almost certain defeat in the Keystone State - but if he can woo enough well-heeled suburbanites along the way, he should be able to keep Clinton's margin of victory down to a manageable level.
