1. What is the average number of microorganisms in the human body?
a) 1 trillion
b) 10 trillion
c) 35 trillion
d) 1 quadrillion

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2. How much length can a person’s fingernail grow per month on average?
a) 1 mm
b) 2 mm
c) 3 mm
d) 4 mm

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3. What special phenomenon is associated with artists Vincent van Gogh and Franz Liszt?
a) Color blindness
b) Chromesthesia
c) Hearing impairment
d) Hypersensitivity to touch

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4. What is the fastest speed at which signals can travel in the human brain per hour?
a) 100 km
b) 200 km
c) 300 km
d) 460 km

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5. How many sweat glands are there on a person’s foot approximately?
a) 100,000
b) 500,000
c) 1 million
d) 2 million

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