Superposition

The assumption that macroscopic objects can remain, if not observed, in a state of superposition is false.

Right now, Tom is in a superposition where he's both dead and alive at the same time.

But the numismatist has none of those aids which the geologist derives from the order of superposition, and the mineral characters of the rocks in which his fossils are preserved; and, in the case of uninscribed coins, has nothing but the type and its geographical range on which to found any conclusion, unless, as in some rare instances it happens, the coins are associated with others of more certain date.

There are three principal tests by which we determine the age of a given set of strata; first, superposition; secondly, mineral character; and, thirdly, organic remains.

Particles can exist in a superposition of states, meaning they can be in multiple states at once.