Below is a quote from Paul Kwait, a scientist at Illinois University. If it makes sense to you, you’ve got a pretty elastic mind. Here’s a link to the story at Physorg.

Quantum what-now?

“It seems absolutely bizarre that counterfactual computation – using information that is counter to what must have actually happened – could find an answer without running the entire quantum computer,” said Kwiat, a John Bardeen Professor of Electrical and Computer Engineering and Physics at Illinois. “But the nature of quantum interrogation makes this amazing feat possible.” Sometimes called interaction-free measurement, quantum interrogation is a technique that makes use of wave-particle duality (in this case, of photons) to search a region of space without actually entering that region of space.