If you are building an authority site and its all white hat then you should be looking to drive traffic to it from any where possible...
Very very bad idea, "driving traffic from anywhere". I remember reading an article about google and site traffic and the conclusion was this: "if you own a kid toys blog/site, and you get traffic from a car site it does no good to you".
This is why google introduces the "disavow tool". I advise you to read too: http://searchengineland.com/not-all-bad-links-hurt-you-google-ignores-links-also-126349
Also, if your site is about kids toys and you have backlinks from chemistry.stanford.edu, it does no good to you, because is not related to your niche.