The key answer of exercise 6
The key to exercise solutions in chapter 7.1 - Learning from experience for the textbook New Total English Intermediate - Students' Book with authors Rachael Roberts, Antonia Clare and JJ Wilson from Pearson Education
Question
What do you think is the connection between light bulbs, crisps, bread and post-it notes? Read the article to find out.
Answer
The items were all invented after failures or mistakes.