LifeCoronavirus lockdown changed how birds sing in San Francisco The uniquely quiet circumstances of the covid-19 restrictions in San Francisco saw birds respond by lowering their pitch, singing sexier songs and making their songs clearer News
ÎçÒ¹¸£Àû1000¼¯ºÏThe covid-19 pandemic was predicted – here's how to stop the next one Covid-19 isn't the first pandemic humanity has faced and it won't be the last. What has happened offers lessons about how to judge and respond to virus warnings in future Features