These are some great resources to learn more about the handy temperature sensor. By viewing these videos, you increase your knowledge of the device, as well as know where its applications are. These videos take an in-depth look at the mechanism of the device: how it works, and its many components. Please take some time to view them.
This one explores thermistors. He even makes a home-made thermistor. He was able to turn on a PC fan using it.
This one explores how machines can control temperatures, while humans would risk burning their hand when they do so.