Business and economy

Bulgaria adopts the euro, replacing the lev, becoming the 21st member of the eurozone. (The Sun)

• https://thesun.my/news/world-news/bulgaria-adopts-euro-as-21st-member-of-eurozone/

Disasters and accidents

Several people are killed and multiple others are injured in an explosion at a bar in Crans-Montana, Valais, Switzerland. (The Guardian)

• https://www.theguardian.com/world/2026/jan/01/several-dead-and-injured-in-explosion-swiss-ski-resort-town-crans-montana-police-say