Title: Muslim world.
Question: How many months are in the Shamsi Hijri calendar?

Title: Mary (mother of Jesus).
Question: What rock was used as the source of blue pigment in paints in Medieval and Renaissance Europe?

Title: Antarctica.
Question: What type of climate did Antarctica have in the Cretaceous period?

Title: Electric motor.
Question:
What kind of counter keeps track of a print head's position?