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I really like to have some variety in my daily liter of tea I drink. Puerh can be steeped very many times, but oolong is pretty good too. Green and white are a completely different ballgame, but I enjoy them as well.
If you keep your daily caffeine dose very low, you can actually get a noticeable boost when you need it. I used to be like that, and next week I’ll start reducing my caffeine intake in order to get to that state again.
And Helen is also pulling heat from waste water. The latest heat pump was just the next logical step.