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Try the same text at a reading speed of 200 words per minute.
This is the text (if you need help).
Why does thinking make us tired? Researchers looked into this. When we think a lot, our brain releases a chemical. It tells us that we must rest. People who spend a long time thinking will feel tired. Resting helps the brain to return to normal. A 20-minute power nap can make us feel totally refreshed.
The researchers tested 40 people. Twenty-four of these had difficult tasks looking at a computer screen. The other 16 people did a similar, but easier task. Everyone worked for six hours. Brain scans showed that the group with the difficult task had more of the chemical in their brain.
Back to the thinking lesson.
