Most people north of the equator have an observable suntan by August. Ironically, a desire to be outside is often coupled with another strong desire to get out of the sun, as indicated by sales of sun umbrellas and other types of sunshades.

A key design feature shared by many 100-year-old barns and some modern skyscrapers is that the external shell carries the building's load with a minimal use of internal columns for support. Internal floors and walls, if any, function in a structural way to stiffen the building.

The eye is an amazing instrument, but it does not function alone. Even with visual receptors rapidly sending data along the optic nerve, no mental image will form at all unless the brain is properly equipped to manage the input. One data processing feature of the brain enables what is called perceptual stability.

In American football, the quarterback can hand off the football to a team member, who then may do a handoff to another player. Exciting plays may be put together that combine several handoffs and even a pass downfield to an awaiting player who, hopefully, carries the ball to the goal.

Scientists observe many changes to animal physiology that occur too quickly to fit the “slow and gradual” concepts favored by classical Darwinian evolution. An illustration of this type of rapid variation is the ever-growing list of dog breeds, which proliferated to over 150 from only a few dozen strains in just a couple of centuries.