science

Nothing says "I'm single and ready to mingle" like a dose of salty digestive fluid. For sea lampreys, anyway. Male sea lampreys use a type of bile salt, which is more typically known for digesting fats, to advertise their genetic fitness to females and readiness to mate, new research shows. This stands in contrast to silver lampreys, which use the enzyme for digestion and other nonsexual functions, said Weiming Li, a researcher at Michigan State University.

Via NASA:

Several key conditions came together to create this award-winning shot. These included a dark night, few clouds, an epic auroral display, and a body of water that was both calm enough and unfrozen enough to show reflected stars. The featured skyscape of activity and serenity appeared over Iceland's Vatnajökull Glacier a year ago January, with the Jökulsárlón Iceberg Lagoon captured in the foreground. Aurora filled skies continue to be common near Earth's poles as our Sun, near Solar Maximum, continues to expel energetic clouds of plasma into the Solar System.