A few weeks ago I was struck by the fact that I don't own any Christmas decorations. I saw
this last month at
BoingBoing, so I decided I had to take the
plunge. Tonight on
ABC they aired the
1965 Charlie Brown Christmas Special that features the tree that I purchased.
While watching the show, I realized that I had the tools to quantify a question that has puzzled me for ages. Just how big a blockhead is
Charlie Brown?
So, I measured the tree:

I took a screenshot from tonight's airing, and established that the tree measured 2.375" on the screen, while Charlie Brown's head measured 1.417" on the screen. With the knowledge that the the tree is 20" tall, setting up a ratio I was able to determine that Charlie Brown's head has a diameter of 11.93" across.

Then we can determine the radius, 5.966", then using the basic formula for finding the area of a sphere,

I determined that Charlie Brown's head has a volume of 889 cubic inches, assuming that his head is a perfect sphere.

Using similar calculations, I have estimated that my own head (not a perfect sphere) is roughly 296 cubic inches.
In conclusion, I have mathematically determined that I'm only a third the blockhead that Charlie Brown is. Of course, we are both a sucker for redheads.