Why are users taking fentanyl, making stuff with moon dust, an app to detect anemia, why octopuses are smart, the real bad guy in Alzheimer's and an absence of volcanoes?

Quirks and Quarks

Drug users aren't choosing dangerous fentanyl - they don't know what's in their drugs; Selfies for health - a smartphone app can detect anemia; Making it on the Moon - 3D printing useful stuff with moon dust; The octopus might have traded its shell for intelligence; Have researchers been wrong about Alzheimer's? A new theory challenges the old story; What would happen to Earth if there were no volcanoes?

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