Axios

Scientists are inching closer to understanding how antibodies and immune cells are unleashed by the body in response to the novel coronavirus.

Why it matters: Natural immunity differs from that afforded by vaccination but it offers clues for the design of effective vaccines and therapies.

Over 19 years, a once rare song sang by sparrows in western Canada has spread across North America, replacing a traditional song along the way, according to new research.

The big picture: Birdsongs, like human languages, have dialects that can evolve, and birds and humans learn their languages in similar ways and timeframes.