Emails to Dr Anthony Fauci show ‘likely’ explanation identified at start of coronavirus pandemic, but there were worries about saying so

And how debate was shut-down to protect "science"

For millennia, people slept in two shifts – once in the evening, and once in the morning. But why? And how did the habit disappear?

Imperial College London researchers warn "no one should rely on this alone" and insist people should still get vaccinated as the "best way" to protect against COVID.