The historic East Broad Top Railroad, a narrow-gauge former coal carrier on its second revival as a heritage line, reached a symbolic milestone Aug. 8 when a train steamed into a rural Pennsylvania ...

Pythagoras' theorem close Pythagoras' theoremPythagoras's theorem applies to right-angled triangles. The area of the square drawn on the hypotenuse is equal to the sum of the squares drawn on the ...

The ST segment is the line between the “S” and the “T” on the readout of an EKG. If a person is in good health, the line appears at or close to the baseline level. A depressed or elevated ST segment ...