that's not a smartarse, that's quite genuinely funny (ymmv)
https://github.com/cariaso/dna
These edits were proposed by Michael Cariaso, whom I met recently. Mike runs a cool site called http://snpedia.com.
SNPedia is like 23andme, except every night SNPedia reads PubMed abstracts to see if it can determine information about more SNPs. So, I believe it now gives information on 10x as many SNPs as 23andme, because it groks a lot more medical research.
SNPedia has a mode where you do not even need to upload your data to them, instead you simply download the program and run it locally. But, regardless, you need to get your DNA, and 23andme is the cheapest option for doing so.
"No instructions on how to build"
(rhetorical musing question)
And also we'll see more people asking for changes on appearance than health.