Old books have a distinct smell that many people find comforting and nostalgic. For some, the aroma is so pleasant that it instantly takes them to childhood libraries or cozy reading corners. But what exactly causes this scent, and why do only certain people...

Georgina RannardClimate and science reporter, Belém, BrazilBBCIt suggests 1,600 lobbyists are in Belém, a 12% rise from the COP meeting last year.It is common for business leaders to come to the talks to strike deals. With the US strikingly absent from negotiations, progress has...