A 22,000-year -old mastodon skull was dredged from the bottom of Chesapeake Bay. What is surprising is that it was dredged up together with a flint spear point. We cannot be absolutely sure the spear point and the skull are related, but if they are, it means humans were in North America before the Bering land bridge. That means American Indians may not have been the first human inhabitants on the continent. The evidence is far too tentative to conclude that, but it is fascinating, at least to me.