One way to tell Boeing 737 family aircraft from their Airbus A320 family counterparts is that 737s have a distinctive flat-bottomed engine. But why? The Boeing 737 was designed at a time when ...

Why do some boats have flat bottoms and others have V-shaped undersides of various angles and contours? Let us introduce the concept of deadrise, how it is intrinsic to V-bottom boats, how it affects ...

We tested flat-bottom- and cone-shaped versions as well as two larger all-in-one carafe-style designs, ranging in price from about $14 to $80. While many looked quite similar, they varied in ...

The flat-bottomed paper bag is a marvel of quiet utility. It stands tall at the checkout counter of grocery stores ready to cradle the essentials of daily life — from fresh produce to a warm ...