Alert! Bragging ahead

Ezra and I have been doing preschool for the past three weeks, three days a week. It's a blast and totally worth the lost nap (mine, not his. Ezra hasn't napped in months).

Ezra can read the word "lava". He knows that strawberry flowers are white, but that strawberries are red. He is quite comfortable with opposites, and knows that "leafy" trees lose all their leaves in the winter, but "forevergreen" trees always have their needles. He can recognize most color names (pink and purple are a little confusing, probably because of the "p"), and he can make up songs about anything in the world. (Fortunately most of his songs are short.) He can write his name (although more than half the time the "Z" is backwards) and is currently having "preschool" with his little sister in the other room.

I think that next week in preschool I'll teach him linear algebra. Anyone know a good textbook?