Therealtestofcharacteriswhetherwecanlearnfrom our mistake, byunderstandingwhyweacted as we did and then exploring ways toavoidsimilarproblems in the future.
Welearnwhy water, unlike most of the substances we run into on Earth, is denser in its liquid than in its solid form (H2O molecules are kinked rather than straight, so the space between them increases when water is quiescent).