Radiative forcing is an empirical fact, derived from physical laws, and has been known for over 100 years.

Liberals may appreciate that conclusion, but it has little basis in empirical fact.

But the benefits of these plans are related to earnings, and now the hard empirical facts support early fears.

Better to stick with what the Constitution actually says and let the empirical facts fall where they may.

"There is no trace of empirical fact or research method," he wrote via e-mail.

Thus, the phenomenon of the chelate effect is a firmly established empirical fact.

For a decade until the late 1930s, people could do no better than to regard the electron as an empirical fact.

In the author's worldview, violence is not just an empirical fact - one aspect of human existence among others.

Scrum patterns, by design, are based on empirical facts and measures.

That is an empirical fact and one which can be proven.