Problem: How many lumber vertebrae are there in the human spine?
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A: 5

Q: What German road system famously has no federal speed limit?
A: autobahn

Problem: Who is the lead female protagonist of Benjamin Britten's opera Gloriana?
Answer: queen elizabeth i

Q: At which port do the rivers Rhine and Maas reach the sea?
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A: rotterdam

Q: How many chromosomes does a normal human have?
What is the answer?

A: 46

Mei Li:
What is the mathematical name for series such as 2, 6, 18, 54 etc where the next term in the sequence is obtained by multiplying the previous one by a fixed number??
Shuai Zheng:
geometric