It practically takes a court order to cancel an account.

FORBES: Don't Fence Me In

The facts are that nearly half of all online orders placed in 2011 included free shipping and 61% of customers surveyed reported they would likely cancel an order if they learned they would need to pay shipping costs.

FORBES: How To Offer Free Shipping And Still Make A Profit

But a vortex mask requires only one telescope whereas an interferometer needs at least two, in order to combine, and thus cancel, several images.

ECONOMIST: Planet-hunting: ESP for ESPs | The