And we thought publishing was complicated in biology

Biologist 1: How many physicists does it take to write a research paper? Biologist 2 (looks at the citation above): "all of them?" I wrote about the challenges that biologists and computer scientists have in deciding who's on first. But after finding some physics papers in PubMed by mistake, I've decided that it must be much harder for the physicists. How do the physicists decide which author goes where? Do they all have to write out their individual contributions?