useless trivia: What Word Means: Outstanding?

Questions

Tests on drugs and poisons determine the LD-50 dose. What does LD stand for?

What is the correct name for brown coal?

What material features in the construction of a "corduroy road"?

Of which country was Faisal, assassinated in 1975, king?

Name the primeval supercontinent which split into Gondwanaland and Laurasia between 250 and 300 million years ago?