Zobaczcie jak łatwo zrobić własną tęczę. Wystarczy narysować flamastrami małe kreseczki na kawałku ręcznika papierowego, a następnie zanurzyć brzeg ręcznika w wodzie. Woda, powoli nasączając ręcznik, tworzy kolorową tęczę. Prawda, że łatwo? To do dzieła!
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