Problem: In 2005, two different designs were used on the reverse of the 50p coin to commemorate the 150 anniversary of the introduction of what?
Answer: victoria cross

Problem: "Who, having been a Lieutenant General with three stars on his epaulettes, was posthumously appointed ""General of the Armies of the United States"" by a congressional joint resolution in 1976, with an effective appointment date of 4 July 1976?"
Answer: george washington

Problem: A Clydesdale is a breed of what animal?
Answer: horse

Problem: Mathematicians Leonhard Euler and Augustus Mobius pioneered 'geometria situs' ('geometry of place'), later called?
Answer:
topology