Attempts to explain the unknown and often unseen can be considered
journeys of the mind. Careful
scientific observation, whether with lens or naked eye, has led
to advances in fields as diverse as microscopy and space exploration.
zoological and botanical publications from the 1700s and 1800s -
the "golden age" of natural history" - have never
been surpassed for beauty and accuracy. Treatises on the movement
of the planets challenged accepted dogma and led to progress in
astronomy, meteorology, and astrophysics.