Given that it had stopped before secondary school, Harry's own science education was woefully lacking. Even so, he replied, "I dunno, it's just that...well, I also grew up not knowing about wizards and magic and wands and all that, but when I came here, I realised how important a wand is for most kinds of magic. For example, if you don't have a wand, how can you protect yourself against the Jelly-Legs Jinx?"