Melanoma. What sunlight does in melanoma, and what it does not.
Sunscreen. What sunscreen prevented in the trials, what the SPF measures, what the filters do in the body, and how the rules and the arguments grew up around it.
Sunburn, tanning, and skin. How long a burn lasts, what sun poisoning is, what was tried as treatment, how a tan forms and what it is worth, why dark skin burns less, and what sunlight does to collagen as skin ages.
Vitamin D. How skin makes vitamin D from sunlight, when and where it can, why people differ and why sunny countries run low, who decided what counts as enough, and what happened when sun and pills were tested against each other.
Babies and pregnancy. How sunlight came to treat newborn jaundice, where filtered sunlight works and why guidelines advise against sun at home, how much sun babies get, and what the studies show about sun, melasma, and sunscreen in pregnancy.
Oxybenzone. Where oxybenzone came from, how it gets into the body and from what, what it does in cells, animals, and people, who reacts to it in light, and how regulators have ruled.
Skin conditions. What real sunlight did for psoriasis, eczema, and vitiligo in the clinics and state programs that prescribed it, what it cost in skin cancer, where it made these conditions worse, and how little is known about acne and rosacea.
Eyes. What sunlight does to the cornea, lens, and retina, what time outdoors does for children's eyes, what sunglasses and eye color have to do with it, and how few of the eye studies measured light at the eye.
How sunlight is studied. Three in four studies of sunlight and the body used a lamp. How research moved indoors, what lamps leave out, how a dose of light is counted, who pays, and how we chose our 784 studies.
