Larry: Hey Ivan (Iggy), what have you got there? Ivan (Iggy): It's casein. Larry: Um... what's casein? Ivan (Iggy): It a protein that makes up about 80% of cows milk! Larry: How did you separate it from the rest of the milk? Ivan (Iggy): I used acetic acid, aka vinegar, I then used a paper towel to filter the casein, once it dries, it'll form a hard brick... thing that's like plastic! Larry: Cool!