The fivesecond rule: Growing germs for science | Science ...
· For the clean tile, I made sure to reclean the tile in between each drop. Each time I picked up a piece of dropped bologna, I rubbed a cotton swab six times all over the side that had touched the floor. For my control — where nothing happened at all — I dipped a cotton swab in a small beaker of distilled water. I now carefully dragged the cotton swab from each sample across an agar plate ...