When you present in Google Slides, you can now have real-time closed captioning by simply clicking the ‘cc’ button when you are in presentation mode. As long as your microphone picks up your voice, your spoken words will scroll along the bottom of your presentation as you speak! With all the fun of the not-quite-transcribed-correctly fair of course…but it worked quite well in my trials and was one of those things you show people and they go ‘wow’!

Microsoft Powerpoint has similar functionality now too.