I didn't give up of this goal at all

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Today I realize that I can use this topic just to write down some curiosities and things that I search and discover how interesting it is!
Curiosities of my day:

- How has been created the “toothpaste”?


- Lightnings in the sky + Planes (what the risk? what happens when…? – and so it goes…)
(I hate yahoo answers, but…)

However, a silly question made me discover an important thing that I didn’t know at all…