Combining climate models with statistical learning allows an assessment of the relative contributions of different factors to trends in winter precipitation at mid-latitudes. Thermodynamic (non-circulation-related) effects are mostly consistent between models and observations, but whether circulation-related changes are forced or unforced remains unclear.

When the concept of ‘click’ chemistry — highly effective and specific reactions — was first reported, some dismissed it as a gimmick. But it has transformed many fields of research.

By precisely shaping the leading edge of ultrafast high-power laser pulses, bright ‘harmonic’ radiation has been generated with great efficiency from plasma oscillating at almost the speed of light. This long-sought regime removes a key barrier to the production of extremely intense electromagnetic fields for applications such as compact particle acceleration, attosecond science and strong-field physics.

An audit of TikTok’s recommendation algorithm using hundreds of automated ‘bot’ accounts during the 2024 US presidential election finds that the ‘For You’ feed of the platform steered users towards Republican-aligned political content, regardless of their initial political leanings.