Fighting began in Lexington and concord when British troops came to arrest colonial leaders and take colonial weapons.

The "aha!" experience is known as insight learning.

Strength of concrete increases with increase in water cement ratio as the strength of the cement is directly proportional to water cement ratio.

The term just noticeable difference is synonymous with difference threshold and refers
to the detection of change.

The olfactory system is the only system in which the receptors send their signal directly to the higher brain and bypass the thalamus, which normally acts as a filter for the processes of the lower brain.