Dermatologists presented with a new patient have a number of symptoms to look at in order to diagnose. Does the patient have a rash, bumps, or scaling skin? Is there redness, inflammation, or ulceration? For rare conditions a doctor may have never seen in person before, it’s likely that they were trained on photos of the conditions—or can turn to colleagues who may themselves have photos. But in people with darker, melanin-rich skin, the same skin conditions can look drastically different, or be harder to spot at all—and historically, there have been fewer photos of these conditions on darker-skinned patients. And for these patients, detection and diagnosis can be life-saving: people of color get less melanoma, for example, but are also less likely to survive it. Dr. Jenna Lester, who started one of the few clinics in the country to focus on such patients, explains the need for more dermatologists trained to diagnose and treat people with darker skin tones—and why the difference can be both life-saving and life-altering. Have you ever met a friend for dinner at a restaurant, only to have trouble hearing each other talk over the din of other diners? And as we get older, this phenomenon only gets worse and can be compounded by age-related hearing loss and conditions like tinnitus. Unfortunately there is no silver bullet for tinnitus or other forms of hearing loss, and researchers don’t even understand all the ways in which the auditory system can go awry. But we now have more sophisticated technology to help us cope with it. Nowadays, there are over-the-counter hearing aids and assistive listening devices that connect with your smartphone. Certain tech allows you to amplify softer sounds and cancel out the noise of a crowded room—it can even focus on the sound waves created by the person you’re speaking with. Ira chats with David Owen, New Yorker staff writer and author of the new book Volume Control: Hearing in a Deafening World about the industry that’s helping millions of Americans cope with hearing loss. Envision California’s lush forests from San Francisco to the Oregon border. Now imagine that 90 percent of those forests disappear within two years. Laura Rogers-Bennett, senior environmental scientist with the California Department of Fish and Wildlife, says that’s exactly what happened to underwater kelp forests off Northern California’s coastline from 2014-16. An analysis published this week in Scientific Reports documents the rapid decline of California’s bull kelp. The study links the reduction in the seaweed’s population to a confluence of environmental and ecological stressors, including a marine heat wave, a sea star die-off and the emergence of an “urchin barrens,” large swaths of subtidal zones overtaken by kelp-hungry purple sea urchins. Rogers-Bennett, who monitors kelp forests in partnership with the UC Davis Bodega Marine Laboratory, says taken together, these strains on the kelp population threaten the greater coastal ecosystem. “We are finding out,” she says, “that if we cross some of these thresholds, that the system will collapse.” Observers are now noting kelp deforestation off the Oregon coast and in California south of San Francisco to Monterey Bay. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

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