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Doctors question a test for IVF embryos

Doctors question a test for IVF embryos

Genetic screening may lead fertility clinics to discard healthy embryos

Doctors are still trying to make sense of the recent rise in cases

Medicare has declined to pay for the controversial Alzheimer’s drug Aduhelm

Drug effectiveness has morphed along with the coronavirus strains, and not all patients are eligible for prescriptions


Some researchers question the scientific basis for the environmental agency’s latest air quality proposals

The BA.2 strain appears more contagious but may not be more severe

Using DNA from 3,609 individuals, scientists map out an ancestral genealogy for the human race

Some hospitals are denying transplants to patients who haven’t received COVID-19 vaccines, but bioethicists say the policy is justified

Nonrandom mutations threaten Darwinian orthodoxy

The James Webb Space Telescope is set to peer further into space than Hubble ever could