Are We In Outer Space

The space between cells is a freeway when youre a Staphylococcus bacterium. A tight barrier of cells is supposed to prevent outside invaders like these Staph bugs (red and purple) from entering the body. The fact that we get sick is testimony that those barriers sometimes fail. Now, University of Pennsylvania researchers have found one reason why: Some pathogenic bugs have the key that opens secret passages in this cellular wall.