Brothers apart?
Gold and lead are both forged in supernovae and are but a few subatomic particles apart in the periodic table. So why is there so much more of one than the other?
Advertisement
Gold and lead are both forged in supernovae and are but a few subatomic particles apart in the periodic table. So why is there so much more of one than the other?
On a March visit to the North Carolina seashore, I encountered this tableau (see photo) of two types of markings on an otherwise pristine sand dune. One of them seems to be a trail left in the surface by a passing arthropod. The other has a mound-like relief and it appears to have been made by the sand being pushed upwards from below. The mounds' height and width are generally uniform along their length, at perhaps 1 and 1.5 centimetres, respectively; there are branches at several points; and nowhere do there seem to be openings to the surface. Does anyone have an explanation?