That's the whole problem with science. You've got a bunch of empiricists trying to describe things of unimaginable wonder.

From Jefferson to Jackson to Lincoln to FDR to Reagan every great president inspires enormous affection and enormous hostility. We'll all be much saner I think if we remember that history is full of surprises and things that seemed absolutely certain one day are often unimaginable the next.

In today's world it is no longer unimaginable to think that business can operate - and even thrive - in an environmentally-friendly manner.

There are no dreams too large no innovation unimaginable and no frontiers beyond our reach.

Determination energy and courage appear spontaneously when we care deeply about something. We take risks that are unimaginable in any other context.