In this issue:
"Near-Light-Speed Mission to Alpha Centauri": A billionaire-funded plan aims to send a probe to another star. But can it be done?
"Cancer Killers": Some advanced cancers can now be successfully treated by synthetic immune cells that are more powerful and longer-lasting than any found in the body.
"Brain Trust": Poverty may affect the size, shape and functioning of a young child's brain. Would a cash stipend to parents help prevent harm?
"Am I Human?": Researchers need new ways to distinguish artificial intelligence from the natural kind.
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