Undeniable Fact: Bread and butter

Ever wonder why penicillin is such an excellent antibiotic? As it turns out, the mold which produces the antibiotic - commonly known as "bread mold" because of its affinity for bread - has developed a complex symbiotic relationship with humans. Since bread does not occur naturally, the bread mold couldn't exist without us. As a result, the mold has adapted to protect its human benefactors with antibacterial chemicals.

(Sorry, comic will go up tomorrow)