sciences: La potion d’invisibilité lien chap 12 T1 Harry Potter
[lien cape d’invisibilité d’Harry, casque d’invisibilité de Persée; les potions]
29/04 On a fait l’expérience proposée par Haëline le 11/03.
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2/05 On a remplacé la glycérine par de l’eau pour voir la différence:
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