Angels can fly because they take themselves lightly.

Grauniard: University vice-chancellors have told the government they cannot completely shut down if the coronavirus outbreak worsens..

Myself: In 1665, following an outbreak of the bubonic plague in England, Cambridge University closed its doors, forcing Isaac Newton to return home. While sitting in the garden there one day, he saw an apple fall from a tree, providing him with the inspiration to formulate his law of universal gravitation.