Ideally, the model should produce similar results to what has happened historically.

This has happened historically, usually slowly, in many past elective monarchies.

Natural disaster, prolonged Concerned about weather cycles of 2-10 years, which have happened historically and can cause crop failures.

"Given what's happened historically, there's a good chance that Congress will not increase the debt ceiling until they absolutely have to."

What has historically happened is that owners in arrears negotiate a payment plan with the city Finance Department.

"That is what's happened historically; that inevitably is what will happen again."

And that has happened historically with other groups, too.

She explained: "We hope to come up with predictive models based on what's happened historically.

It is a good time to think about how improvements in public health have happened historically.

And if this has happened historically, they say, penguins may be affected by climate change today.