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) ...

In science, a variable is something that can be changed, measured or controlled in an experiment. Scientists look at variables to understand how they affect things. A variable is any one of the things ...

I introduce the notion of a 'control variable' which gives us a way of seeing how mental causation could be an unproblematic case of causation in general, rather than being some sui generis form of ...

The key variables involved in controlling biological waste treatment processes-substrate variables, physical and chemical variables, suspended solids variables, and biological activity variables-are ...