When a was a kid – not quite a teenager, but close enough – I fell big-time into the UFO craze, reading book after book about ancient aliens visiting us (just what else explains those biblical angels “floating in mid-heaven”?), and swallowing all their claims pretty much whole. How, for example, could ancient cultures have created giant figures on the ground, such as giant stylized hummingbirds, without alien overseers hovering in spacecraft to guide them? And how else to