text: You've already answered it yourself. :^)\n\nIt is probably the greatest single organized repository of all human information ever known.\n\nWhat makes it great is that anyone can contribute but anyone can also correct, edit, or flag problems with the information in any article.\n\nI dare say that many articles have many more people review them and improve them than any other encyclopedia on the planet.\n\nIt would appear that many contributors are professional experts in their fields.\n\nOn the topics of math, I've found much better, more comprehensive information than you can find in many books.