BECAUSE OF MOLECULES WE ARE CONNECTED TO THE OUTSIDE WORLD FROM OUR BODIES. LIKE WHEN YOU SMELL THINGS, BECAUSE WHEN YOU SMELL A SMELL IT'S NOT REALLY A SMELL, IT'S A PART OF THE OBJECT THAT HAS COME OFF OF IT, MOLECULES. SO WHEN YOU SMELL SOMETHING BAD, IT'S LIKE IN A WAY YOU'RE EATING IT. THIS IS WHY YOU SHOULD NOT REALLY SMELL THINGS, IN THE SAME WAY THAT YOU DON'T EAT EVERYTHING IN THE WORLD AROUND YOU BECAUSE AS A SMELL, IT GETS INSIDE OF YOU. SO THE NEXT TIME YOU GO INTO THE BATHROOM AFTER SOMEONE ELSE HAS BEEN THERE, REMEMBER WHAT KINDS OF MOLECULES YOU ARE IN FACT EATING.