Title: Frédéric Chopin.
Question: What historian commented that the events involving Frédéric's friend in Poland contributed to his maturing?

Title: Ottoman Empire.
Question: The conquest of Nice was an effort by Suleiman and what French king?

Title: John von Neumann.
Question: What was the consequence of the theory of incompleteness?

Title: Wood.
Question:
Along with strength, what property do wood fibers lend to wood?