rational, reasonable, logical

An entry. / Filling in, filling out (such as forms or papers).

Frankfurt, Frankfurt-am-Main (the largest city in Hesse, in central Germany) / Frankfurt, Frankfurt-an-der-Oder (a sizable town in Brandenburg, in eastern Germany)

frankfurter, a kind of sausage

Hamburg (the second-largest city in Germany) / Hamburg (a state of Germany containing the city of the same name)

distance / mental distance, psychological gap

bacteriologist

archaeologist

One should be able to derive new understanding while revising what he has learned. Learning from the past.

On things that are past, it is needless to pursue past mistakes; let bygones be bygones.