The key answer of exercise 4

a)

• 'The human computer' can do amazing mathematical calculations.
• 'The human camera' can remember complex buildings and draw them.

c)

Daniel

1. He couldn't make friends. Aged eight, he was able to calculate 82 x 82 x 82 x 82 in his head, but he couldn't tie his own shoe laces, or ride a bicycle.
2. He has an incredible ability with numbers.
3. He appeared on a TV programme and recited 22,514 numbers from pi perfectly.
4. He went to Iceland and learnt Icelandic in a week.
5. He is now a bestselling author.
6. He has published several books, including Born on a Blue Day, Embracing the Wide Sky and Thinking in Numbers.

Stephen

1. He couldn't make friends. In fact, he talked to nobody, showed no interest in school subjects and wasn't able to sit still.
2. He is a brilliant artist. His eye for detail is perfect. He can see a building just once and remember everything about it.
3. He appeared on a TV programme drawing a complicated building.
4. He has been to London (England), Rome (Italy), Hong Kong and New York (USA). He drew pictures of the cities seen from a helicopter
5. He has published several books of his drawings.
6. He is now an artist.