Hints and tips:
...It is not unknown for them to ask coaches to manipulate the model making so it points in the direction they have already chosen....
...And this is just to mention the obvious uncertainties: there’s also the problem of what former US defence secretary Donald Rumsfeld called “unknown unknowns” — dangers that we don’t yet know about....
...When Barack Obama chose John Roos, a lawyer and fundraiser who was prominent in Silicon Valley but unknown to the wider public, as ambassador to Japan in 2009, some officials in Tokyo fretted that the choice...
International Edition