I've actually read about this before, but still never found any technical details about how the test works. My inner conspiracy theorist worries that a pharmaceutical corporation has bought this idea up.
With all due respect, when you submit your own blog post to HN, you could at least have the courtesy to take 5 minutes to proofread it. And when you don't, it comes across as unprofessional and undermines any ethos you may have had, and I am very unlikely to read past the second paragraph.
While I applaud the effort, I do not understand the motivation. When I want to develop something, I use a desktop or a notebook, and I'm never away from one long enough that I would have no choice but to work on a mobile device.