power of Wikipedia

With Wikipedia you can choose your own path of education. What do you need school for? (in Polish)

adjusting to students exhibiting different levels of knowledge

on how to create effective courses for students:

• Be accessible to students with limited prior background, who may well need extra coaching especially in mathematics and physics. Lecturers will need to be willing to adjust the pace and content of the course as it proceeds, and should plan for this.
• Be challenging and interesting for students with excellent backgrounds. Enough material should be made available (for example in harder problems) to fully occupy better-prepared students. Additional evening mini-lectures on advanced topics will be encouraged.