Teething — it’s happened to all of us and none of us remember it, but everyone knows it makes babies cry.

While the actual process is much longer and arguably more painful, it only takes an unusual time-lapse video 20 seconds to show just why that’s the case.

(H/t Mental Floss)

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A MARTA operator is seen inside the control room of one of the new MARTA trains during the unveiling of these trains on Thursday, Jan. 30, 2025. (Miguel Martinez/AJC)

Credit: Miguel Martinez-Jimenez