The Great Mental Models Volume 2: Physics, Chemistry and Biology
Reciprocity can be summed up like this: when you act on things, they act on you.
Shane Parrish • The Great Mental Models Volume 2: Physics, Chemistry and Biology
Jet propulsion only works if the forward push is stronger than the forces acting on the object, like air friction and its own weight.
Shane Parrish • The Great Mental Models Volume 2: Physics, Chemistry and Biology
propulsion is a force that drives an object forward.
Shane Parrish • The Great Mental Models Volume 2: Physics, Chemistry and Biology
Forces always occur in pairs of the same type of force, and it is not possible for one object to exert a force without experiencing a reciprocal force.
Shane Parrish • The Great Mental Models Volume 2: Physics, Chemistry and Biology
In physics, reciprocity is Newton’s third law, which states that for every force exerted by object A on object B, there is an equal but opposite force exerted by object B on object A.
Shane Parrish • The Great Mental Models Volume 2: Physics, Chemistry and Biology
People rewrite and reshape their memories, often to fit their existing beliefs. We often feel committed to our original perception and unconsciously adjust our memories to support what we think we originally saw.
Shane Parrish • The Great Mental Models Volume 2: Physics, Chemistry and Biology
Our memories are highly subjective and malleable.
Shane Parrish • The Great Mental Models Volume 2: Physics, Chemistry and Biology
Perspective-taking in psychology refers to the ability to perceive a situation from an alternative point of view.
Shane Parrish • The Great Mental Models Volume 2: Physics, Chemistry and Biology
relativity highlights a subjectivity of perspective that explains partly why eyewitness testimonies have lost their credibility over the years.