There are several everyday things and items that millennials have never heard of. For instance, Green Stamps and 8-inch floppy disks are two items they probably haven?t heard of. They have also probably not heard of the energy drink called Tab that according to Business Insider, lost popularity after ?scientists linked the drink?s sweetener, sodium saccharin cancer.? To find out more items they may not know about, read Business Insider? article, ?17 things most millennials have never heard of.?