To look, rather than to assume. A check is what turns a belief into a finding.

In accordance with what is so. Also to make it so — the same word for the state and for the repair.

Held as true by someone. Knownness is a fact about a knower, not about the thing.

A made sign left on a surface. The oldest form of record, and the root beneath both writing and counting.

One unit of a clock's counting. A tick is the smallest interval a system can tell apart.