I just learned imaginary numbers. Very cool!

NPR has really opened the door on this channel. Outstanding work. You appear to be an aspiring critical thinker engaged in improving our world. I am subscribing. Thank you for doing this.

Another NPR listener here, appreciating concise lessons in math and finance. I wish I could turn on all my colleagues at work to your YouTube site.

It would be great if you do a bit on organic chemistry.

These are great! I heard you on NPR tonight and I immediately thought to check it out. I'm so glad you have a Bio section, it's already helping me understand my AP Biology class! Thank god for you. You're preforming a civil service =].

you are 100 times better than the teacher at my school LOL! thank you man! I learn a lot form your video!
hope u can make the organic and inorganic chemistry video!

I teach elementary school and the kids love trying to solve brainteasers. These are so much fun, challenging, and a great way to learn. Thanks for passing on your great lessons!

I am so glad you are here. I hate math and I have been looking for help. I can't wait to use your videos. Thank God for NPR.

I am taking placement exam after two days. I just heard you on NPR and I am going to put you to test. I was always good at math and so far I am liking what I see on your channel. Thank you.

learned about you through npr as well! i'm very grateful for what you're doing and hope you're able to continue for decades to come.