Wait, make that 16, technically the one girl likes Kotaru instead of Negi. And then there is Setsuna and Konoka who seem to be a couple, but both like Negi too....
If you mix Sodium Chlorate or aluminum powder with sugar it turns into explosives, but if I remember what the history channel said, it degrades very fast. Also very good at blowing up in your face.
This made me laugh.
If I remember correctly there is this one chemical that reacts with sugar when mixed to become explosive, but I can't remember what it is.....