Question

"I could feel his anguish." What could be the anguish?​

Answer 1

Answer:

To express his thoughts, he needs to depend on the computer. Communicating through computer often turns out to be a futile effort. Whenever he fails to expand his thoughts through the machine, he  feels anguish.

Explanation:

Answer 2

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Stephen Hawking’s mind was active with many thoughts that he wanted to express. However, his thoughts came out in phrases, without reflecting his feelings or emotions. His sentences were mere lines, without any sentiment. The writer felt he could understand his anguish and frustration at that.