How gravity causes a perfectly spherical ball to roll down an inclined plane is part of the elementary school physics canon. But the world is messier than a textbook. Scientists in the Harvard John A.

For the customization-inclined, additional toppings allow for personalization of your burger experience ... This cross-section reveals the burger’s magnificent strata—each layer of beef, cheese, and ...

In order to ensure representative coverage households were selected within nine socio-economic categories or strata: (7) All groups in suburbs and apartment house areas in towns of varying sizes (8) ...