A cursory review of the numbers makes me think this is a scam. > Hard sciences such as Physics and Biology pay rather less well than I would have expected. Interestingly, when I used the calculator to search for a BS in Physics, it says "No Statistics for that Degree". I also find it a bit hard to believe that optometrists and lawyers make out better than doctors, or that the lifetime value of a Physician's Assistant…
When looking at median salaries for physicists, on the BLS site (where this data is taken from: http://www.bls.gov/oco/ocos052.htm), it is $103,000 which isn't all that bad (if you can get a job). But, the problem with the proxy that the author uses (given job, extrapolate major) is that it doesn't account for fields where relatively few people actually get jobs in that field, but tend to migrate to other fields--depending on what field they migrate to, then the salary may be much higher or lower. Take physics for example. The fraction of physics PhDs who actually get jobs as professors is rather small. The fraction who go on to national labs is small--even the numbers for industry (doing physics) is small and many people leave for other fields (programming, financial engineering, management consulting, etc.)--So to get accurate numbers, what you need to do is to survey people at companies and ask them what their degree is and what their salary is....