Recently I was reviewing some saved emails and I came across this post by Laura D'Aquila and Abigail Klein. Please check it out since it is inspiring to see how their backgrounds led to their creation. Their intention in creating closed captioning for Google Slides is to improve the lives of those with disabilities. Presenters can use the closed captioning button when presenting in Google Slides and the microphone captures what is being said fairly reliably and displays it as a caption. I've used it however to help students practicing their presentation because it helps them monitor the clarity and enunciation of their words. They create a presentation in Google Slides, click present, and then click the CC (closed caption) button to practice their presentation. If the captioning can't capture what they are saying reliably, then they could be speaking too quickly or mumbling. It's a useful tool for students who speak fluent English to use when rehearsing. Granted, it would not be useful for students who have a strong accent or a mouth full of braces or a retainer.