As the U.S. Food and Drug Administration (FDA) readies itself to introduce new rules on sunscreens, strong new evidence suggests overall sun exposure in childhood is most likely to develop into deadly skin cancer later in life. The news comes as the government is finishing long-awaited rules to improve sunscreens.
The FDA wants sunscreens' rating to be based not in on how well they block the ultraviolet-B rays that cause sunburn (today's SPF rankings) but for how well they protect against deeper-penetrating ultraviolet-A rays that are linked to cancer and wrinkles
