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Since MoJo’s May/June 1993 cover story, “Beach Bummer,” which alleged that most sunscreens do not prevent malignant melanoma skin cancer, and may actually promote the potentially fatal cancer, two scientific reports on the subject have been published. The first, in the October 14 New England Journal of Medicine, described an Australian study in which sunscreen users showed a significant reduction in solar keratoses, a risk factor for skin cancer. Sunscreen did not prevent cancer; it simply reduced the likelihood of developing one of ten risk factors.

The U.S. media overstated the study’s findings and neglected to report that the sunscreen used in the study was nothing like what most Americans apply. Until recently, most sunscreens available in the U.S. blocked just one type of ultraviolet light–UV-B, the rays that cause sunburn. Deeper-penetrating UV-A rays, on the other hand, are barely blocked at all. Even “broad-spectrum” sunscreens only block about one-third of UV-A. But the sunscreen used in the study blocked 94 percent of it.

MoJo’s article focused on the theory that UV-A might be the culprit in the melanoma epidemic of the last twenty years. At the time of the article, there was no animal model to prove this. But last July, as reported in Proceedings of the National Academy of Sciences, researchers at Brookhaven National Laboratories induced melanoma in fish. “In this animal model,” the researchers wrote, “90 percent to 95 percent of melanoma may be attributed to UV-A. . . . It is reasonable to extend this conclusion to humans. Sunscreens effective in the UV-B region would not protect against melanoma induction by sunlight.”

Sunscreens that largely block UV-A include Photoplex and Shade UVA Guard.

SIX TRUTHS

Reclaiming power from those who abuse it often starts with telling the truth. And in "This Is How Authoritarians Get Defeated," MoJo's Monika Bauerlein unpacks six truths to remember during the homestretch of an election where democracy, truth, and decency are on the line.

Truth #1: The chaos is the point.

Truth #2: Team Reality is bigger than it seems.

Truth #3: Facebook owns this.

Truth #4: When we go to work, we're in the fight.

Truth #5: It's about minority rule.

Truth #6: The only thing that can save us is…us.

Please take a moment to see how all these truths add up, because what happens in the weeks and months ahead will reverberate for at least a generation and we better be prepared.

And if you think journalism like Mother Jones'—that calls it like it is, that will never acquiesce to power, that looks where others don't—can help guide us through this historic, high-stakes moment, and you're able to right now, please help us reach our $350,000 goal by October 31 with a donation today. It's all hands on deck for democracy.

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SIX TRUTHS

Reclaiming power from those who abuse it often starts with telling the truth. And in "This Is How Authoritarians Get Defeated," MoJo's Monika Bauerlein unpacks six truths to remember during the homestretch of an election where democracy, truth, and decency are on the line.

Truth #1: The chaos is the point.

Truth #2: Team Reality is bigger than it seems.

Truth #3: Facebook owns this.

Truth #4: When we go to work, we're in the fight.

Truth #5: It's about minority rule.

Truth #6: The only thing that can save us is…us.

Please take a moment to see how all these truths add up, because what happens in the weeks and months ahead will reverberate for at least a generation and we better be prepared.

And if you think journalism like Mother Jones'—that calls it like it is, that will never acquiesce to power, that looks where others don't—can help guide us through this historic, high-stakes moment, and you're able to right now, please help us reach our $350,000 goal by October 31 with a donation today. It's all hands on deck for democracy.

payment methods

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