Slow Fast Slow app

https://johnjohnston.info/blog/wp-content/uploads/2020/08/IMG_9928.mp4

‎Slow Fast Slow is a nice app for changing speed of videos on iOS. I discovered it via a nice tutorial by
Andrew Brooks Rework Time – Playing with time using the Slow Fast Slow App with slow-motion video. I think my class might enjoy this especially if the sandpit is still full of water.