Write the next sentence in the following story.

How to candle an egg
Understand why you need to candle your eggs.
When you are hatching eggs at home, it is good practice to keep track of how the eggs are developing. However, this can be very difficult (if not impossible) without the use of candling.
Candling involves shining a bright light into the egg, allowing you to see its contents and check whether it is developing properly. When you are hatching eggs at home, you will never get a 100% hatch rate.