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Sunscreen
Sunscreen (also known as sunblock) is a lotion, spray or other topical product that helps protect the skin from the sun's ultraviolet (UV) radiation, and which reduces sunburn and other skin damage, ultimately leading to a lower risk of skin cancer.
The best sunscreens protect against both UVB (ultraviolet radiation with wavelength between 290 and 320 nanometres), which can cause sunburn, and UVA (between 320 and 400 nanometres), which damages the skin with more long-term effects, such as premature skin aging. Most sunscreens work by containing either an organic chemical compound that absorbs ultraviolet light (such as oxybenzone) or an opaque material that reflects light (such as titanium dioxide, zinc oxide), or a combination of both. Typically, absorptive materials are referred to as chemical blocks, whereas opaque materials are mineral or physical blocks.
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Health & Medicine News
October 24, 2026
Oct. 24, 2026 A small device that gently stimulates nerves through the ear could offer a new way to tackle stubborn high blood pressure. In a clinical trial of 63 patients already taking medication, the treatment proved safe, easy to use at home, and well ...
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Oct. 24, 2026 Scientists have discovered that switching off a protein called Mitch makes human cells burn more fat and prevents new fat cells from developing. The breakthrough builds on experiments in mice that showed remarkable resistance to obesity and improved ...
Oct. 23, 2026 Scientists discovered that the thick, sticky fluid surrounding glioblastoma tumors can make brain cancer cells smaller, more flexible, and better at invading surrounding tissue. Even more troubling, ...
Oct. 23, 2026 Researchers have uncovered a surprising reason dental implant infections often resist antibiotics: the implants themselves can contribute to the problem. Bacteria corrode titanium implants, releasing microscopic particles that hijack immune cells, ...
Oct. 23, 2026 A newly FDA-cleared PTSD treatment uses personalized brain mapping and magnetic stimulation to target abnormal brain activity, with a clinical trial reporting a 52% reduction in symptoms and 68% remission. Researchers believe the technology could ...
Oct. 23, 2026 A seven-year study found that people with Parkinson’s disease who were more physically active experienced slower declines in memory, thinking, and movement abilities. Those exercising more than ...
Oct. 22, 2026 Cambridge researchers have created a groundbreaking $10 optical sensor that delivers the precision of laboratory equipment in a device small enough for wearable technology. It identified foods, ...
Oct. 22, 2026 Researchers have uncovered a hidden immune defense capable of attacking small cell lung cancer, an extremely aggressive disease that often escapes conventional treatments. The specialized immune cells can recognize and destroy cancer cells even when ...
Oct. 22, 2026 A surprising two-year clinical trial found that fish oil supplements successfully delivered omega-3s to the brain but failed to improve memory or protect against Alzheimer's-related brain shrinkage. Researchers suspect that getting these nutrients ...
Oct. 22, 2026 Scientists have captured virus-like particles assembling themselves step by step, revealing how a surprisingly simple process of trial and error produces complex structures with remarkable precision. The discovery uncovers a crucial molecular ...
Oct. 22, 2026 Researchers have developed a revolutionary microscope that uses an incredibly powerful laser to make previously invisible cellular structures easier to see. The technology dramatically improves image clarity, allowing scientists to examine small ...
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Oct. 22, 2026 Your morning coffee may be packing more calories than you realize, and sugar isn't the biggest reason. A study of 30,000 Americans found that non-dairy creamer has overtaken sugar and milk as the ...
Oct. 21, 2026 A natural compound extracted from a medicinal plant has shown surprising promise against rheumatoid arthritis. In rats, it reduced joint swelling, protected cartilage, and calmed the immune responses ...
Oct. 21, 2026 A simple, steroid-free procedure could offer lasting relief for people struggling with carpal tunnel syndrome, potentially helping them avoid ...
Oct. 21, 2026 Researchers analyzing nearly 150,000 Reddit posts uncovered unexpected symptom reports linked by users to unapproved versions of retatrutide, ...
Oct. 21, 2026 A massive study of more than 460,000 Americans found that ultra-processed foods were not associated with increased colorectal cancer risk overall, ...
Oct. 21, 2026 Scientists have uncovered an unexpected danger lurking inside cells: too much RNA can damage the structures responsible for producing energy. A new study found that excess RNA, including the normally ...
Oct. 21, 2026 A new study tracking 13 astronauts suggests that the human heart may be surprisingly well equipped for a journey to Mars, especially with regular exercise during spaceflight. Researchers found that ...
Oct. 21, 2026 Scientists have turned blood cells from an 80-year-old into neural stem cells with a molecular age of less than 20, effectively reversing more than ...
Oct. 21, 2026 A new Penn State study suggests that just four minutes of daily strength training can significantly improve mobility and physical function in older adults. After 12 weeks, participants showed ...
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