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You may have missed…

Extinct species returning, not-so-foolish fool’s gold, intergalactic highways, and more – here’s what went on in last week’s science news.

A composite image showing a stream of intergalactic gas as it appears in X-rays, visual light and radio waves.
The Northern Clump as it appears in X-rays (blue, XMM-Newton satellite), in visual light (green, DECam), and at radio wavelengths (red, ASKAP/EMU). Credit: Veronica et al., Astronomy & Astrophysics