Aristotle accepted the spherical shape of the Earth on empirical grounds around 330 BC, and knowledge of the spherical Earth gradually began to spread beyond the Hellenistic world from then on. In modern times, belief in a flat Earth has been expressed by isolated individuals and groups; this new featured picture is a flat-Earth map drawn by Orlando Ferguson, not much more than a century ago. One of only two copies, it is held in the Library of Congress.
This week's "Featured content" covers Sunday 24 – Saturday 30 July
