Though the exact length of a "stadia" is unknown, his measurement is thought to be accurate to within one percent of the ...

In London's St. Paul's Cathedral, a whisper can be heard far across the circular whispering gallery as the sound curves around the walls. Now, an optical whispering gallery mode resonator can spin ...

The number represented by pi (π) is used in calculations whenever something round (or nearly so) is involved, such as for circles, spheres, cylinders, cones and ellipses. Its value is necessary to ...

It's a question that has plagued the minds of human beings since the beginning of time: Is the Earth flat, or is it round? The answer has been floated around for centuries. The ancient Greek ...