Research suggests a cat’s purr may lower human stress levels, though scientists still debate the mechanism behind the effect.

mental calmness and composure, especially in difficult situations.

persisting tirelessly; incapable of being fatigued.

something reused or altered but still bearing traces of its earlier form.

the appearance of being true or real.

in a shy, reserved, or unconfident manner.

a feeling of fear or agitation about something that may happen.

having or showing keen mental discernment and good judgment; wise or shrewd.

little known or difficult to understand; abstruse.

the state of being unwilling or unable to believe something; disbelief.

an approach that evaluates theories or beliefs in terms of practical application and results.