Input question: Usually represented by lower case n, which optical property is the ratio of the velocities of light in two adjacent media?

Output answer: refractive index

Input question: On 14 November 1910, Eugene Burton Ely was the first to do what in an aeroplane?

Output answer: take off from ship

Input question: Nicknamed 'Tom Thumb of The Americas', which former Spanish colony is the smallest country in continental America?

Output answer: el salvador

Input question: The logo of Cancer Research UK has a pattern of dots in the shape of a triangle. How many dots are there?

Output answer:
10