You've heard the age-old riddle: "Which came first: the chicken or the egg?" Taken metaphorically, it's a meditation on the futility of determining the cause of a self-perpetuating cycle. Taken ...

Get your news from a source that’s not owned and controlled by oligarchs. Sign up for the free Mother Jones Daily. These kinds of eggs are called amniotic eggs because of the way they keep the ...

Feathers are important for birds today, enabling flight, warmth, and communication. Now, researchers from the University of Geneva have traced the origin of feathers. Scientists believe feathers ...

Scientists have visualised the early development of the nervous system in a chicken embryo. Minyoung Kim at the University of California, San Francisco, dissected the 2-day-old embryo out of its egg ...