A math teacher found an unexpected platform for his lessons
Zhang Xudong says uploading calculus videos to adult sites earns him over $27,000 a year.
Blending equations with unconventional marketing
He turned viral curiosity into steady income — proving even calculus can break the internet
Zhang Xudong says uploading calculus videos to adult sites earns him over $27,000 a year.
Blending equations with unconventional marketing
He turned viral curiosity into steady income — proving even calculus can break the internet
A math teacher found an unexpected platform for his lessons
Zhang Xudong says uploading calculus videos to adult sites earns him over $27,000 a year.
Blending equations with unconventional marketing
He turned viral curiosity into steady income — proving even calculus can break the internet
