En die idee is jy vinnig vorentoe en goeie studente begin skielik algebra druip begin skielik kalkulus druip, ten spyte dat hulle slim is, ten spyte dat hulle goeie onderwysers het, en dit is gewoonlik dat hulle het hierdie Switserse kaas gapings wat gehou gebou het regdeur hul fondasie. So ons model
And the idea is you fast forward and good students start failing algebra all of the sudden, and start failing calculus all of the sudden, despite being smart, despite having good teachers, and it's usually because they have these Swiss cheese gaps that kept building throughout their foundation.