What a dude backbone boards 1+1= Tube
A math teacher at Dana Hills High School in Southern California, circa late 1970s. The photo was posted by the engaged educator’s son on r/OldSchoolCool 4 years ago and making the rounds again.
“My dad teaching math in Southern California (late 70s/early 80s)”
He’s finally retiring after teaching for 40 years at the same school, so the yearbook had him recreate the picture.