As noted in a previous column, bubbly ice is glacier ice containing trapped air bubbles. Scientists have confirmed what Paddy Quigley, of Ivar’s, has always known, Guinness bubbles sink. At the University of Edinburgh’s School of Chemistry, it was proven bubbles flow down instead of upward. Early observations thought once the dark liquid hit the glass there was the illusion the bubbles were going down. Closer examination revealed as the pint settled, bubbles touching the walls of the glass experienced drag, preventing bubbles from flowing up. Bubbles in the middle of the glass rise freely causing bubbles at the edge to be pushed downward on the inside surface. Ivar Quigley and his sister Belinda, langers from Cork, believe Smithwicks Lager does the same.

Fastcast: Chilly, maximum sunshine.