NASA considers using nuclear bombs to destroy Moon-bound ‘city killer’ asteroid 2024 YR4

If asteroid 2024 YR4 hits the Moon, it could launch dust and small rocks into space, creating micrometeoroid debris in low Earth orbit.
Williamsport Sun-Gazette

Reflections in Nature: So what’s the difference between algae and scum?

Have you noticed the many ponds and backwater areas that are covered with green scum? The fishermen are upset because this scum fouls up their fishing lines and boat motors. Those who have fish tanks, ...