Third post in a row, but I think this was the best joke of the event.   It was from a member of the audience.

It is a bit depressing that the need for star to be as it is, for a planet to be in the Goldilocks zone, the long and tentative first steps to life, the millions upon millions of combinations of pairs of multicellular organisms, of evolutionary changes of almost unimaginable time, and the almost chance meetings of one human male with a female was the exact and unique sequence needed to lead up to Boris Johnson.