<human>:  Why did Bell Labs invent the transistor?
<bot>: That would be because of a man named John Bardeen. He was a physicist who was working at Bell Labs. He invented the transistor. He did this because he wanted to make it easier for engineers to build circuits. He wanted to make it so that engineers didn’t have to build everything from scratch. Instead, he wanted to make it so that engineers could use the same parts over and over again.