Barry Bonds and Mark McGwire steroid history by baseball cards

This is pretty funny - a look at Mark McGuire and Barry Bonds over time, by comparing a baseball card for each player year by year.  Try and guess when each started taking steroids by the pictures.  The pictures above are of their rookie seasons; compare that to other years, and other photos (in truth the baseball cards don't have the most easily noticeable pictures, but the idea is great all the same).
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