useless trivia: What Word Means: Ludicrous?

Questions

Of the Somme With what acid do nettles cause irritation?

Of waterloo Common name for the family comprising a peculiar group of spiny, fleshy plants native to America?

Of what was Charlie Chaplain's cane made?

Of who did the u.s postal service print 500 million stamps in 1993?

Office what is the name of the film in which steven segal's character dies?