A study in Science tested one AI model on 146 kinds of findings in abdominal CT scans. Radiologists who used it caught about 10 more real findings out of every 100, with a small rise in false alarms. Here is what the test showed, and what it did not.

Doctors in Philadelphia designed a gene-editing drug for a single infant in about six months. The early results are real, but they come from one child and a few weeks of follow-up.

A 2025 study reported tiny bits of plastic in human brains, with more in people who had dementia. The finding is real news, but it is not proof of harm.

A large US trial found that close monitoring was not worse than usual surgical care for low-risk DCIS over about two years. Here is who it applies to, what counts as not worse, and why two years is only a start.

NASA's Perseverance rover found a Martian rock with spots that ancient microbes could have made. The chemistry is exciting, but the team says labs on Earth offer the best chance to settle it.

A large 2025 review linked about 7,000 steps a day with lower health risks. The finding is useful, but it is not a new magic number.

A birthday cutoff in Wales created an unusual test of the shingles vaccine. People who could get the shot were diagnosed with dementia less often. Here is why this study is stronger than most, and where it still falls short.

A large 2025 trial randomly assigned colon cancer survivors to an exercise program with a coach. Fewer of them had their cancer return or died. Here is what the numbers mean, and who they apply to.

Can poor sleep in middle age lead to dementia? A landmark 30-year study suggests a link between short sleep and increased risk.