Problem: The 'House Martin' is a common summer visitor to these shores, so too is which other 'Martin'?
======
A: sand martin

Problem: "What weapon is used in Tchaikovsky's ""1812 Overture""?"
======
A: cannon

Problem: Pinchbeck, a 1700s alloy of copper and zinc, was a popular alternative for?
======
A: gold

Problem: Who was the first American President to resign from office?
======
A:
richard nixon