Today on 91av
All the latest on newscientist.com: lost volcano set off an ice age, Homo skull 1.8 million years old, genes and education, new language of life and more
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Earth
Huge smoke cloud turns day to night in Sydney harbour
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Today on 91av
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Space
Massive remnant of meteor surfaces from Russian lake
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Enigma Number 1771
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Feedback: Drink up your oxygen
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Not his cup of tea
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Magnetic marbles anyone?
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Silk stockings
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Earth
Labyrinthine M. C. Escher stairs line vast Indian well
What depths would you go to in search of water? In Rajasthan's dry season, people must descend eight storeys of intricate staircases in a huge step well
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Today on 91av
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Life
Ghost elephants win Wildlife Photographer of the Year prize
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Space
Golden wrapper to protect Milky Way mapper
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Today on 91av
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