Rather than a history of inventions, Mr Rosen's book is a study of invention itself, the process of tinkering with an existing mechanism to make it better.

ECONOMIST: Why it started in Britain

Understanding the mechanism of cannabinoid-induced analgesia has been increased through the study of cannabinoid receptors, endocannabinoids, and synthetic agonists and antagonists.

FORBES: Billionaire May Try to Legalize Medical Marijuana in Ohio

Roche Holding (otc: RHHBY - news - people )is expected to release results of a big study showing that its experimental osteoporosis drug Boniva, which works by the same mechanism as Fosamax, can protect bones when given only once a month.

FORBES: Breaking Merck's Bones