Video narration
7 Things You See Every Day But Don’t Understand—fast. One: the tiny hole on a phone camera? It’s a microphone for clearer audio. Two: the little metal strip in a chip bag seals the bag and can help block moisture. Three: the black dots around a car windshield help the glass bond evenly and reduce glare. Four: that ridge in a plastic bottle cap shows the tamper seal broke. Five: the hole in a pen cap is a safety vent to reduce choking risk. Six: the colored stripes on toothpaste tubes are factory marks so machines cut and fold the tube right. Seven: the arrow next to your car’s gas icon points to the side the fuel door is on. Now you know—seven mysteries, solved.