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美国出台了一项新政策，旨在降低联邦资助的危险病原体研究带来的风险。该政策在科学界引发了褒贬不一的评价。即使一些支持加强监管的科学家也担心，其中含糊不清的措辞非但不能明确政府将资助哪些研究，反而可能使相关规则变得更加复杂。西藏林芝调研发现，玉米双穗现象较为普遍，这为挖掘单株生产潜力提供了启示。

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（图片来源：《Science》）

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