But scientists are hardly alone in being affected by the knowledge of its existence.

More worrying still, most shop assistants had no knowledge of their existence.

The trail leads to two men who deny any knowledge of the brother's existence.

This voice was my first knowledge of his existence.

The other argument, which is founded on a man's knowledge of his own existence, stands thus.

The subjects may be able to accept the knowledge of our existence.

Unless someone has prior knowledge of their existence and requests them, they might not even be mentioned.

Regardless, upon his knowledge of the play's existence, the king had the actors sent away and the theatre shut down.

True, but until then I'd no knowledge of the child's existence and therefore no time to think about things.

Thank you again, Traveler, for trusting me with this knowledge of your existence.