The Matthew effect is a phenomenon in which those who are already successful are more likely to continue to be successful, while those who are not successful are more likely to continue to struggle.

The site-effect of the medication was a mild headache.

The site effect of the medication is drowsiness.

The Marangoni effect is the flow of liquid caused by surface tension gradients.

The McGurk effect is a fascinating perceptual phenomenon.

The McGurk effects can be influenced by visual cues.

The Woozle effect is a phenomenon named after the fictional character Woozle.

The Simon effect is a phenomenon in cognitive psychology.

The Lombard effect is a phenomenon where speakers involuntarily increase their vocal effort in noisy environments.

The Forer effect is a psychological phenomenon that refers to the tendency of people to accept vague and general personality descriptions as accurate and specific to them.