But until it's possible to know how big that liability is, it is impossible to judge the impact on Merck--and on other big drug companies.

FORBES: Behind Merck's Fall

It is possible to earn a profit and be responsible, but it is nearly impossible to do both perfectly.

FORBES: BP Under Fire: Profit Versus Responsibility

It is impossible to anticipate all the possible ways in which regulations can be evaded.

ECONOMIST: World economy

Recognize that in the beginning stage of your idea there is no possible way to truly predict exactly what the future will hold because it is impossible to have every future fact you need to know.

FORBES: Ideas are a Dime a Dozen. People Who Implement Them are Priceless

Is it possible to succeed at a task you thought was impossible?

FORBES: The Art Of Possibility

"It's possible to reinforce control on that border, but closing it is virtually impossible, " said analyst Mohamed Chafik Mesbah, a retired officer of the Algerian army.

WSJ: Militants Grab U.S. Hostages in Algeria

Every manager knows in his heart of hearts that it is highly unlikely or indeed impossible that the client will receive the performance he or she is led to believe is possible.

FORBES: Everyone Wants Kool Aid: Pruning the Money Management Tree (October 29, 2008)