Science tests bold ideas against human biology and space hardware

Summary

A timelapse of the aurora australis was filmed from orbit and shared by NASA astronaut Jessica Meir. The footage shows the Southern Lights sweeping across the atmosphere from the vantage point of the International Space Station.

Why it matters

Space-based views make the scale and mechanics of space weather clearer, strengthening awareness of risks that can disrupt satellites and infrastructure.

Summary

Experiments in mice show that when an expected reward does not appear, acetylcholine spikes in the brain and increases the odds the animal abandons its old choice and tries a new strategy. Blocking acetylcholine reduces that flexibility and makes mice persist with outdated actions.

Why it matters

It points to a concrete neurochemical lever for breaking rigid behavior, with implications for treating addiction, OCD, and other habit-driven disorders.

Summary

A philosophical critique argues that the popular block-universe picture rests on a category mistake that confuses what exists with what merely occurs. It contends that this confusion drives muddled claims about space-time and the status of past, present, and future.

Why it matters

It redraws the line between physics and metaphysics in time debates, which shapes what we think our best theories actually imply about reality.

Summary

A volunteer diver filmed a great white shark in the Mediterranean between Tunisia and Sicily and said he was shaking during the encounter. The shark is described as endangered, making confirmed sightings and usable footage uncommon in the region.

Why it matters

Evidence of an endangered apex predator in the central Mediterranean can trigger stricter conservation measures and sharpen priorities for tracking and bycatch reduction.