Researchers claim flashes of light seen in sky surveys could have been UFOs drawn to Earth by nuclear tests, but more mundane ...

The flashes of light were taken during the Palomar Sky Survey, a project that mapped the northern sky between 1949 and 1958.

1. The reflection of light from the surfaces of many kinds of leaves has been measured by means of a direct reading spectrophotometer, the measurements being made normal (that is, at an angle of 90⚬ ...

Researchers demonstrate a new technique for suppressing back reflections of light, leading to better signal quality for sensing and information technology. Researchers demonstrate a new technique for ...

I SUPPOSE that everyone is familiar with the beautifully graded illumination of a paraffin candle, extending downwards from the flame to a distance of several inches. The thing is seen at its best ...