John Tyndall: remembering the Carlow man who discovered why the sky is blue

John Tyndall's blue sky tube

Born 200 years ago, John Tyndall, a policeman’s son from Leighlinbridge, Co. Carlow, developed a love of problem-solving at Ballinabranagh National School.

As a young man, he would rise early and chew coffee beans while reading about aerostatics and phlogiston, then go off to make hot air balloons.