(left to right)
Geography = globe
Economics = coupon
Political Science = MOTLAGH badge
History = $ 1 coin

A geographer can use the globe to find out where places are in the world.
An economist can use this coupon to find out what half prices people can get from different stores.
A political scientist can use the MOTLAGH badge to determine one of the people that was running for Birmingham School Board.
A historian can can use the coin to see how much money and average coin that big would be worth.