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Scientists have grown kidneys containing mostly human cells inside pig embryos, an important step toward growing kidneys and potentially other human organs.

Lab-engineered human embryo models created from stem cells provide a look at development beyond the first week. But they raise ethical questions.

Get latest articles and stories on Science at LatestLY. In the "black box" of human development known as gastrulation, an embryo transforms from a hollow, spherical structure to a multilayered one. Human embryos are typically not cultured for longer than 14 days due to bioethical concerns, and gastrulation happens between 17 and 21 days after fertilisation. Science News | Researchers Use Extraembryonic Tissue to Produce Entities That Resemble Human Embryos.

A Washington Post article warned about the harmful effects fireworks have on air quality ahead of Fourth of July celebrations, comparing them to recent wildfires.

As smoke from Canadian wildfires lingers across much of the United States, Americans will soon experience another smoke show: Fourth of July fireworks. It may come as a surprise, but the federal holiday stands out as the most polluted day of the year in many locations across the nation, according to air quality data. Fireworks […]