Half Life T1/2

[@39az_]

بذمتي انك كفو اهنيك ❤️❤️

[@pietekoo5559]

Concise and understandable. Thanks.

[@fatimaf.al-musawy1451]

thank you so much 😍 the better and shorter explanation

[@Nawaf-es9or]

You very helpful 💙💙💙 thank you very much, short and complete expelnation 👌👌👌

[@rosegallus4048]

I wish the presentation could be much longer.

[@moransan5291]

thank you .. you helped me alot ^_^

[@hagy7393]

Dear Prof, great lecture videos, how can these lectures be accessed for printing out? www.Lulu.com don't work

[@ka2025ABC]

very nice, thank you

[@kaylasimpson4458]

Thank you