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Human Body
Brain
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How far back does the first evidence of brain surgery go?
0%
11th century
0%
18th century
0%
16th century
0%
7,000 B.C.
Explanation
Brain surgery could be the oldest form of medicine. It was practiced in the late stone age (around 7,000 BC) with remarkable levels of success.
How many thoughts does the average human have every day?
0%
70000
0%
5000
0%
1000000
0%
700
Explanation
We have around 70,000 thoughts per day. But 98% of those thoughts are repetitive – we had them yesterday as well
The hippocampus is the part of the brain you use for learning and memory. In what group of people is this part larger?
0%
London taxi drivers
0%
Brain surgeons
0%
Rocket scientists
0%
Physics professors
Explanation
Brain scans show that a London taxi driver generally has a larger hippocampus than usual. This is due to having to memorize the streets of London when in training.
When is the best time of the day to be creative?
0%
At night
0%
After lunch
0%
First thing
0%
Mid-morning
Explanation
This is a trick question. The brain performs better for creative work like writing or drawing (as opposed to problem-solving) when it's tired. So late at night is generally the best time to be creative.
How much of your brain do you use?
0%
All of it
0%
10%
0%
50%
0%
75%
Explanation
Despite the common myth that we only use 10% of our brains, we actually use almost all of it, even when we sleep.
What appliance could you run on the power generated by the human brain when awake?
0%
A lightbulb
0%
A refrigerator
0%
A car battery
0%
A small power drill
Explanation
An awake brain generates 23-25 watts of electricity, enough to power a lightbulb.
At what age does the human brain reach full maturity?
0%
25
0%
45
0%
30
0%
20
Explanation
The brain doesn't stop growing until the age of 25. Babies are born with large heads to accommodate rapid brain growth.
How much of the brain is made of water?
0%
73%
0%
50%
0%
36%
0%
22%
Explanation
Almost three-quarters (73%) of the brain is water. It needs this amount to stay functional. Therefore, if you feel forgetful or 'slow,' you might be dehydrated.
What percentage of the body's energy intake is used by the brain?
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20%
0%
5%
0%
15%
0%
10%
Explanation
The brain uses up 20% of the body's energy intake. It also consumes the same percentage of the oxygen we breathe.
How much does a brain weigh?
0%
Three pounds
0%
Five pounds
0%
Four pounds
0%
Two pounds
Explanation
The average human brain weighs around three pounds and is the size of two clenched fists.
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