Topic
UV Science Basics
articles.
Every UV Science Basics article in the journal — sourced, science-led, zero hype.
- UV science Why Clouds Are Not Sunscreen Overcast doesn't mean off-duty for your skin. Read it →
- UV science What the UV Index Actually Means (and When to Care) That little number in your weather app is more useful than you think. Read it →
- UV science UVA vs UVB, Explained Like You're Scrolling at 2AM The single most useful thing to understand about sun damage, in 60 seconds. Read it →
- UV science The Spots Everyone Misses: Ears, Scalp, Lips, and Tops of the Feet The places you forget to cover — ear tops, the part in your hair, your lips, the backs of your hands — are exactly where skin cancers like to start. Read it →
- UV science Sun Damage Adds Up: How a Lifetime of UV Becomes Spots and Precancers The five-minute walks and sunny commutes you forgot about are quietly compounding into the spots and precancers that show up after 40. Read it →
- UV science Does Sunscreen Expire? When to Toss Last Summer's Bottle FDA rules mean your bottle should hold its SPF for three years — but a summer in a hot car can quietly cut that short. Read it →
- UV science What UPF Really Means on Clothing (and When Fabric Beats SPF) A UPF 50 shirt blocks 98% of UV all day without a single reapplication — here's how that label actually works. Read it →
- UV science Does Sunscreen Block Vitamin D? Balancing Sun Safety and Vitamin D The 'but I need sun for vitamin D' objection to daily sunscreen, settled with the AAD's actual position. Read it →
- UV science Tanning Beds and Melanoma: The Hard Numbers Behind the Carcinogen Label Indoor tanning isn't a gray area - it sits in the same cancer-risk category as tobacco, and the numbers explain why. Read it →
- UV science UV and Your Eyes: Why Sunglasses Need to Block 100% (Not Just Look Dark) You protect your skin from UV - but the part most people forget is sitting right behind those sunglasses. Read it →
- UV science The Hidden Harm of UV: How Sunlight Quietly Disarms Your Immune System Beyond burns and wrinkles, UV does something most people never hear about - it temporarily switches off part of your skin's defenses. Read it →
- UV science How UV Light Ages Your Skin: The Science of Photoaging Daily sunscreen is the most evidence-based anti-aging step there is, and the science of photoaging explains exactly why. Read it →
- UV science Does Blue Light Damage Skin? What the HEV Research Actually Shows Cutting through the 'blue light skincare' hype: here's what's actually evidenced about visible light and skin, and for whom it matters most. Read it →
- UV science 30 Years of Data: Rising UV Is Driving Melanoma Most in Wealthy, Low-UV Countries A 2025 analysis of 176 countries reframes who is most at risk as surface UV climbs, and it isn't only the sunniest places. Read it →
- UV science How the Ozone Layer Is Your First Line of UV Defense Before any sunscreen touches your skin, a thin band of atmospheric ozone is already filtering the sun's most dangerous rays. Read it →
- UV science PA+ to PA++++ and PPD: How Asian Sunscreens Rate UVA Protection Those plus signs on your K-beauty and J-beauty sunscreen are a precise UVA grade, and here's exactly what they measure. Read it →
- UV science 'Water Resistant' Isn't 'Waterproof': Reading the 40- and 80-Minute Labels There's no such thing as waterproof sunscreen, and the number on the bottle tells you exactly when your protection runs out in the water. Read it →
- UV science Why the Two-Hour Reapply Rule Is the Step You Keep Skipping Your morning application has an expiration time, and a higher SPF doesn't buy you a longer day in the sun. Read it →
- UV science How Much Sunscreen Are You Actually Supposed to Use? The Teaspoon & Shot-Glass Rule Your 'SPF 50' may be performing like SPF 20-25 for one simple reason: most people apply only a fraction of the amount the label was tested with. Read it →
- UV science When Is UV the Strongest? The 10 a.m.-4 p.m. Rule Explained There's a simple, memorable window for the most intense sun of the day—and understanding solar noon explains exactly why it exists. Read it →
- UV science Why UV Is Stronger at the Beach, on Snow, and at Altitude Ski trips and beach days hit you with UV from below as well as above—here's the physics of reflection and thin air that makes them so deceptively intense. Read it →
- UV science Climate Change Is Now a Skin Cancer Driver: Longer UV Seasons, Slow Ozone Recovery A 2025 review shows warming isn't just longer beach days—it lengthens UV seasons and pushes melanoma rates higher in places that were never sun-prepared. Read it →
- UV science Can You Get Sun Damage Through Car and Office Windows? Your windshield blocks most UVA, but the side window barely tries — which is why drivers age unevenly and why glass isn't real sun protection. Read it →
- UV science Up to 80% of UV Gets Through Clouds — Yes, You Still Burn Gray skies feel like a sunscreen day off, but up to 80% of UV slips through cloud cover — so the burn and the DNA damage still happen. Read it →