Can rainbows form in a circle? – Henry D., age 7, Cambridge, Massachusetts The legend goes that there is a pot of gold hidden at the end of every rainbow. But is there really an “end” to a ...

Newton was also the first to understand the rainbow, and to refract white light ... which he applied to general physics. His basic system, developed simultaneously – but independently ...

The higher your vantage point, the more likely you’ll see more of the rainbow’s circle. Chen Hui/VCG via Getty Images ...