Earth
Black lava from this bizarre volcano could reveal Earth's deep secrets
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Explore the most exciting new ideas and emerging concepts in science, health, technology and the environment with 91av’s exclusive in-depth articles, interviews and long reads.
Humans
Why do we grieve? The surprising origin of the feeling of loss
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Life
Why is the universe just right for life? Blame the multiverse
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Physics
Why is quantum theory so strange? The weirdness could be in our heads
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Physics
Why is the universe intelligible? Things aren’t as clear as we think
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Humans
Why are we irrational? How a logical flaw stops us solving problems
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Life
Why does evolution happen? The rules on Earth may well be universal
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Physics
Why is there something not nothing? The big bang isn’t the only answer
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Physics
Why does time only move forwards? Possibly just because we’re ignorant
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Humans
Why are we good and evil? A single quality may be at the root of it
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Physics
Why is there a cosmic speed limit? It could even be why we're here
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Life
Why haven't we heard from aliens? There is a reason for the silence
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