It was a lecture that felt like a lot of thought and effort went into making it. Each lecture was short, but it contained all the key points, and it was a great lecture that was easy to understand. I've never seen this level of quality at this price before, so I think my expectations will be high from now on and I won't be able to watch other lectures carelessly. ps. I'm personally a fan of citric acid... I hope you'll be able to increase your stamina and see you again. Thank you.