Problem: Which of the retina's cells can distinguish between different wavelengths of light?
Answer: cone cells

Problem: What is the baseball term coined by Henry Chadwick to collectively call the pitcher and the catcher?
Answer: battery

Problem: What was the first name of Mary Shelley's 'Frankenstein'?
Answer: victor

Problem: Which rank in the Royal Navy is equivalent to that of brigadier in the Army?
Answer:
commodore