Astronomers say the Boomerang Nebula is the coldest place in the universe at one degree Kelvin (minus 458 degrees Fahrenheit). It's even colder than background space.
Although playing recorded song to lure a bird into view is frowned upon by birdwatchers, some people still do it. Will these new findings get them to stop?
Scientists traced iron deposits that occupied the space of long-gone central nervous system tissue. An outline of a 520-million-year-old central nervous system emerged.