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New tech allows parents to 'score' IVF embryos for desirable traits — and it's in desperate need of regulation
By Sam Trejo, Daphne O. Martschenko published
Opinion Companies now offer polygenic embryo selection to prospective parents undergoing IVF. But the technology is dangerously underregulated.

Best fitness trackers for beginners 2025: From Apple Watch to Garmin Forerunner 165
By Lloyd Coombes last updated
Buying guides These are the best beginner-friendly fitness trackers you can buy in every category, from Apple Watch and Garmin Forerunner 165 to Amazfit Active

We tested the 'first wooden, sustainable air purifier' and it's a thing of beauty
By Anna Gora published
Reviews The IQAir Atem Earth is the most elegant, eco-friendly air purifier we have ever tested, and we absolutely love it for that. It is by no means flawless, though.

Diagnostic dilemma: 83-year-old man's unusual form of syphilis had an 'uncertain' source
By Sophie Berdugo published
A man went to the emergency room after being in and out of hospitals for a month, and doctors found a surprising explanation for his illness.

Sleep deprivation harms the gut via the vagus nerve, early study reveals
By Sahana Sitaraman published
New research reveals that sleep deprivation sends aberrant signals through the vagus nerve, triggering a serotonin surge that can kill gut stem cells.

Mineral sunscreen leaves an annoying white cast on skin — this new formula could change that
By Victoria Atkinson published
Scientists have developed a new approach to formulating mineral sunscreen that could prevent it from leaving a white cast on the skin.

Best electric toothbrushes for kids 2026: Fun, effective and tested by experts.
By Joanne Lewsley last updated
Buying Guide These are the best electric toothbrushes for kids, from Oral B Kids and Philips Sonicare for Kids to AutoBrush Sonic Pro.

Many men lose their Y chromosomes as they age. It may shorten their lives.
By Jenny Graves published
A researcher explores why men lose their Y chromosomes in cells as they age and the health implications associated with this loss.

Vaccine denial sets Americans up for more chronic illness
By Janna K. Moen, Christine Miller published
Opinion Despite well-established links between pathogens and chronic illness, the U.S. government continues to weaken public health measures to treat and prevent infectious diseases — a strategy that will ultimately make Americans even sicker.

In a first, study links maternal genes to risk of pregnancy loss
By Zoe Cunniffe published
For the first time, scientists have identified genetic variants that increase the risk of aneuploidy, in which cells have an abnormal number of chromosomes. Aneuploidy in egg cells can lead to miscarriage.
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