Transcript
One person is whispering to another.
Whisperer: Psst—Teach your kids to pronounce F's in the middle of words as V's, but don't write down why you're doing it. Pass it on.
Caption: How sound changes happen.
Title text: Sound change is caused by a secret group of conlangers discussing questions like, "How can I plausibly get centering diphthongs from Middle English's phonology?"
