Science magazine put Big Pharma firms Abbott Laboratories ($ABT), Novartis ($NVS), Roche, Eli Lilly ($LLY), AstraZeneca ($AZN) and Bayer on its list of the best biopharma employers. But none of the world's biggest drugmakers cracked the top 10, unless you count Roche's Genentech unit, which captured the third-place slot. Report