Scientists in labs across the world have used gene modification to create virus-resistant pigs, heat-tolerant cattle and fatter, more muscular lambs - potential improvements for animal agriculture - but will people ever eat them? asks reporter Carolyn Johnson in the Washington Post.

Johnson opened her story with a scene from UC Davis, where UC Cooperative Extension specialist Alison Van Eenennaam was conducting ultrasounds on cattle to determine whether they were pregnant. The animals had been implanted with embryos...