SpaceHow excited should we be by signs of life spotted on alien worlds? We keep spotting molecular “biosignatures” in the atmospheres of planets beyond Earth, but it isn't clear if any of them can provide definitive evidence that we’re not alone Features
EnvironmentCuriously cool summers in US Midwest linked to crop irrigation For 75 years, the US Midwest has experienced unexpectedly cool summer temperatures – the “warming hole” could be due in part to intensive agriculture 51