We have reviewed the referral as it was sent, not as a set of theoretical questions about what is or is not an impeachable offense in a vacuum, but a specific set of 11 grounds tied closely with the facts as the independent counsel has presented them.

CNN: Transcript: Schippers, Lowell briefings before Judiciary panel, part 2

Edward Teller and George Gamow had set up a series of meetings among astronomers and theoretical physicists who shared the goal of exploring the key energy issues of the period.

FORBES: A Veterans Day Story: Immigrants and the Atomic Bomb

In a cash-balance plan, the company contributes a set amount of salary for each worker every year to a theoretical account for him (even though the money is actually managed in one big pot), and then credits his account with some guaranteed annual return--typically the yield on 30-year Treasuries.

FORBES: Magazine Article

The theoretical component of the course included training in how to set up and run a small business, in this case tree nurseries.

UNESCO: Ecological Sciences for Sustainable Development