Understanding Population Pyramids & The DTM (AP Human Geography) 

watching these videos while i'm stuck at home doing online class, thank you for making them!! they help out a lot, you explain concepts very well :)

i’m going through and watching as many of these videos as i can 2 hours before the exam lol

Watching for my ap human geography class winter break challenge and I am so happy it’s here

you are my hero, thanks :3

You are my savior for making this video

He's the only thing keeping my GPA up lol

Mr. Sinn for president

You are the BEST. I can't thank you enough for making all these wonderful useful videos!!!

Thank you so much! It makes sooo much more sense now! I’m way more confident in my work! Huzzah!

Watching everything an hour before my test :D

Really good video you deserve so much more subscribers.

Can you talk about West Africa population pyramid? That's very specific

「もっと多くの人が必要なので、このビデオをもっと

Thanks very much it really helps

Thanks for helping the world 🌍🌎❤

Much learn

Thanks a lot! Appreciate your effort!

I gotta feeling he from Oblock or Cabrini greens?

I'll admit, I won't use this info much, not even when I'm in school, but it's helpful. Thank you Mr.Sinn

Mr sinn you are amazing

Very nice

Nice

International business student here- business environment

You are such a life saver

Very cool 😎

Very smart

Great vid!

Thanks a lot..awesome class

Tysmmmm

Thanks for sharing

Thank you for making this video, your knowledge is too great for this mortal realm. My supple and fragile eyes must not view any longer than it takes to write this out, may your knowledge reach those who do not believe in the power of Sinn...

Thanks! This makes sense now 😅

Epic

Thank you this video was very good and helped a lot

a simple but excellent explanation

United Arab Emirates

I've learnt so much. thank you Mr. Sinn

There needs to be a non-binary part to it

I'm here to learn about stage 6. Very disappointed w/ this video.