human tetrachromats?

via etopiei, orally:

Are some women tetrachromat? i.e. are most people relatively colorblind?

How plastic is a baby's brain? Would giving him/her extra cones at birth produce color vision? What about the adult brain?

This seems like a respectable paper:
Richer color experience in observers with multiple photopigment opsin genes

bleg: biometric data

Hypothesis: most of the variation in adult human height is due to variation in leg length.

I'd like to test this. Where can I find a dataset?

What statistical method would I use? It's easy to measure the s.d. in total height and s.d. legs, and since the legs make an additive contribution to the height, this is an easy problem. But just having the 2 s.d.'s isn't as good as having the leg-length data related to the height data.

But in general, explaining variation in terms of variation of other factors sounds like factor analysis.

I really should study more statistics.