Comet last seen in stone age to make closest approach to Earth
C/2023 A3 (Tsuchinshan–Atlas) was discovered last year and is thought to orbit the sun every 80,000 years
The age of extinction
Botanists identify 33 global ‘dark spots’ with thousands of unknown plants
Kew study reveals areas with at least 100,000 undiscovered plant species – most likely to be under threat of extinction
Growing a ‘word forest’: the Kenyan teacher trying to save her language from extinction
The Yaaku people long ago assimilated with the majority Maasai, and few still speak Yaakunte, but there is a new determination to save their culture – and their forest – before it disappears
