They worshiped the sun as a god and built temples for it. They danced for it and wrote poems about it. They devoted unfathomable amounts of time, money and effort into studying it, and even built probes that could fly out into space and get a closer look. And yet, the sun is tricky. We need sunlight for vitamin D, and to help regulate our sleep cycles, but it inspires people to go stand up paddle boarding, and then to tell you again and again about how you really have to try stand up paddle boarding.

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Organizations: National Cancer Institute, National Institutes of Health