I don't because science is supposed to be based upon observation.

My conclusion was based upon considerable observation of your species.

Upon observation of further evidence, this procedure may be repeated.

The second seems, upon observation, like a prayer for creativity, or at least, accuracy.

He had abandoned the etiquette books, falling back upon observation to show him the right things to do.

As a nation, we should not rely alone upon personal observations about the state of race relations to draw our collective conclusions.

This was based upon observations of a group of 110 asteroids.

The latter is founded upon observation; and it is not new with us at all.

Faith was no leap in the dark but depended upon "exact observation and correct thinking."

Old ideas, formed upon insufficient observations, even if erroneous, were slow to die.