useless trivia: ---------- tongues were a common delicacy at Roman feasts.?

Questions

what latin word is used for information of little use?

of sin, cos or tan, which graph is not differentiable at all points?

with what acid do nettles cause irritation?

common name for the family comprising a peculiar group of spiny, fleshy plants native to america?

of what are an arc, radius and sector a part?