Title: Muslim world.
Question: What is the definition of haram?

Title: Circadian rhythm.
Question: With how many proteins can the circadian clock of Synechococcus elongatus are needed to reproduce its effect?

Title: Frédéric Chopin.
Question: What type of bass do Chopin's mazurkas exhibit?

Title: Comprehensive school.
Question:
What are two locations in which all secondary schools were converted to comprehensives in the '70s?