World Science: Earliest known animal tracks found?
* Found: earliest known animal tracks?:
Scientists claim to have found possibly the earliest
animal footprints, but admit their report will stir
* Religion can spur goodness -- sometimes:
Belief in God has fostered cooperation that aided
the rise of some large, stable societies,
* AIDS pandemic may be a century old:
A study suggests the most pervasive strain of HIV
began spreading among humans between 1884 and 1924.
* "Nanoparticles" may seep through skin:
The health implications of tiny, artificial
objects in the body are uncertain, investigators