Misc: In 1265 1st ---------- Parliament formally convened (some authorities). ?

Questions

Nationalities - Which people invented the compass?

Nature - Approximately how many pounds of salt is in every gallon of seawater?

Nature - At which time of year do children grow fastest?

Nature - By what process is rock worn down by the weather?

Nature - During pregnancy, how many times its normal size does the human uterus expand?