As I write this, the kid who lives next to me is singing along to a polka. It’s a long but very uptempo tune. He’s really getting into it; I can hear him through the wall quite well. He also laughs quite a bit when there is no one else in his room. At least he is happy.
Poison gas pictures from WWI - These images are, to me, rather powerful. Particularly “British infantry advancing through gas” and “British 55th (West Lancashire) Division troops blinded by tear gas.”