This audio lecture is delightful, easy to understand for those who have pondered the infinite while having a love of mathematics as well (I have not yet taken calculus but have had all else up to that point). I only wish that I could see the lecturerer and what he is doing on the board. But if you want to take an infinite voyage in and with your mind...this will take you there. Love it! Thank you so much for making this (and infinitely more:-) for free!! Apple, ITunes...their makers rock as do the schools and professors from K-U and beyond. Nothing else, in all of infinity, can communicate the openess and support of education for all than an organization that takes part in such endeavors!