What does 6, 7 mean in slang, is it brainrot? About the viral six seven trend

Are you wondering what the six seven meaning is in TikTok viral trend? Here's what to know about the 6, 7 slang expression and brainrot.
New Scientist

The most important mathematician you’ve (probably) never heard of

Ask someone to name the most important physicist of the 20 th century, and they will almost certainly say Albert Einstein. Ask the same question about the field of mathematics, however, and you will ...