““Reactions. That’s what Major Tom said. Science is all about reactions. Chemistry is about reactions – potassium in water. Physics is about reactions – how a light comes on when you flip a switch. Even biology is about reactions – how Ellie said one thing with her mouth when he asked if Delil was her boyfriend, but the subtle physiological changes, the reddening of her cheeks, the momentary dilation of her pupils, said another. Reactions.””
