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Figure This!

The shortest air route from New York to London passes over Iceland. It is part of a great circle, not a straight line.

A CAT scan is based on the x-ray principle: as x-rays pass through the body they are absorbed or weakened at differing levels creating a matrix or profile of x-ray beams of different strength. This x-ray profile is registered on film, thus creating an image. (CAT stands for Computerized Axial Tomography.)

Hospitals often use a continuous colored line on the floor to direct patients from place to place in the building.

Some historical sites use lines on the pavement to indicate the path of self-guided tours. One example is the Freedom Trail in Boston, Massachusetts.

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