Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to [email protected]. Can rainbows form in a circle? – Henry D.

This is a milestone year for Tom Clancy's Rainbow Six Siege. It feels like yesterday that Ubisoft Montreal introduced the ...

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