News Above the Noise—Week of April 19, 2026
1. Iran Shuts Down the World's Most Critical Oil Passage—Again
Iranian Revolutionary Guard gunboats opened fire on a tanker Saturday just 24 hours after the waterway had reopened and sent oil prices falling. Iran's new supreme leader, making his first public statements since taking power, said the navy stood ready to inflict "bitter defeats" on its enemies. Read more here.
2. What Alzheimer's Tests Are Missing in Women
Nearly two-thirds of Americans living with Alzheimer's are women, yet the standard screening test gives men and women the same score with no adjustment for biological differences. A new Georgia State study found that women's brains may actually be compensating during early disease stages, recruiting additional regions to maintain cognitive performance, which means significant deterioration can be happening beneath the surface of a normal-looking test result. Read more here.
3. Severe Morning Sickness Is Not in Your Head
Severe pregnancy sickness has long existed in a fog of misunderstanding. Scientists are now mapping how multiple systems in the body—from hormones to brain signaling—interact to drive it. The condition’s ripple effects can extend to pregnancy outcomes and long-term health. With clearer answers, the path forward for patients may finally come into focus. Read more here.
4. Cannabis Use Is On the Rise, Especially Among People Over 60
As cannabis use expands, so do questions about its long-term impact. Research points to shifts in memory, brain connectivity, and even vulnerability to certain mental health conditions. At the same time, scientists are exploring whether some effects could be protective under the right circumstances. Read more here.
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