It’s that time of the year. The leaves are starting to change colors. This week the National Weather Service in Atlanta shared the satellite image above showing fall foliage changes in the Appalachian ...

A chilly fall with bright, sunlit days will leads to the most vibrant color display. Rainy or cloudy days can lead to a ...

It’s all to do with the raindrops, says one reader, with them needing to be relatively uniform in size and well separated for ...

1). The first frequency combs were generated using tabletop devices made from high-performance optical fibres and lasers that emitted short pulses of light 4, 5. For their contributions to the ...