Imagine you're a researcher studying how sleep affects mood. To explore the connection, you would look at two key "variables": sleep (how much someone gets) and mood (how happy or irritable they feel) ...

Resources for observational comparative research have expanded enormously in recent years to include very large sources of ...

The article about using animal models in human health applications was informative (C&EN, March 20, page 30). The predominant use of male rodents in many studies was shown to raise serious questions ...