I discovered a new law of physics.

When I have a bit of tea in a glass and add water to it, as long as I look from above, the tea doesn't get any darker or lighter (it keeps the same shade all the time). Because although it gets more diluted, the layer of tea becomes thicker.

This comes in handy when making tea from a concentrate. Pouring the concentrate into a glass, I look from above and pour until I get the shade I want in the final result. Then I add water.

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