What's the Kennection? #47

Welcome to Kennections, a weekly quiz created by Jeopardy! champion/co-host Ken Jennings. Here's how to play: All five answers to the questions below have something in common. Can you figure it out? (Note: We've given you a hint by showing you how many letters are contained within the answer, but this quiz is not interactive.)

1.  What does the ‘H’ stand for in the five-category SSHWS, also called the Saffir-Simpson scale? 

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2. How many U.S. presidents have been only children, with no brothers or sisters?

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3.  The term “pony car” derives from what 1964 model, Ford’s longest-running car brand of all time?

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4.  What kind of animal is Swoop, Philadelphia’s NFL mascot? 

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5. Silas Weir Mitchell, the “father of neurology,” was the first doctor to use what ghostly term for pain from an amputated limb?

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