Now, even grass - fed beef attains the same marbling and fat content as corn - fed. (bonappetit.com)
Mirsky: In the article, you talk about one way to look at the statistical method to figure out the population based on this is if you had a jar full of marbles, and you dip in and you take out a few and you mark them, then you put them back in the jar and mix them all up again, then dip in again and see how many of the same marbles that you've already pulled out you pull out again. (scientificamerican.com)