Story archive
Browse SciQuest reporting and explainers in reverse chronological order, with the newest evidence-led stories first.
news Astronomy Evidence status: Peer reviewed · Observations of one system
JWST and ALMA find two feeding black holes 4,900 light-years apart in a merger 1.3 billion years after the Big Bang. How we know, and the X-ray caveat.
explainer Biology
Why do dogs eat grass? A survey of 1,571 dogs and controlled trials show grazing is normal and rarely linked to illness. The real risks, and when to call a…
explainer Biology
Cats purr at about 25 to 30 Hz to signal contact and calm, but also when hungry or hurt. How the larynx makes the sound, which cats purr and the…
explainer Biology
Most horses live 25 to 30 years and a few pass 40, yet many die much younger. Ponies vs horses, the 62-year record, human-year maths and ageing by teeth.
explainer Earth
How cold is Everest? The summit averages about −35 °C in winter and −18 °C in July, by our station-based estimate. Base Camp, wind chill and why it is so…
explainer Chemistry
Liquid nitrogen is −195.8 °C (−320.4 °F, 77.36 K) at sea level. How scientists know, what changes it, how long it lasts, its uses and why a spill can suffocate.
explainer Chemistry
Dry ice is −78.5 °C (−109.3 °F, 194.7 K) at sea-level pressure. Why it sublimates, how it compares with liquid nitrogen, how long it lasts and safe handling.
news Earth Evidence status: Peer reviewed · Hindcast evaluation plus one real-time competition year
Nature study: probabilistic bias correction doubles ECMWF's AI model's week 3 to 4 forecast skill, from 0.03 to about 0.06. What that does and does not mean.
news Earth Evidence status: Official announcement
Metrology delegates voted on 15 October 2026 to end leap seconds: from 20 May 2027 UTC runs continuously and may drift up to 3,600 s from Earth time.
