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ϟ HEADLINES‘The Childhood of Ruins’: ordinary lives on the brink of upheavalA Luxembourg magazine Nov 9, 2026

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Iridescent colours on a cloud observed in Brampton, Canada, in January 2019.

Science · Nov 8, 2026Iridescent clouds: diffraction, the source of colour in the skyClouds with colourful reflections can appear without rain. Their iridescence comes from the diffraction of light by tiny droplets or crystals, a mechanism distinct from those behind rainbows and halos.

Lenticular clouds in smooth layers above snow-covered Mount Rainier, Washington State, in 2011.

Basic science · Oct 26, 2026Lenticular clouds: why do they seem to stand still in the wind?Their lens-shaped form sometimes stays in place while air flows through them. Condensation, terrain and mountain waves explain this apparent paradox.