Vending machines became popular in the late 1800s at railway stations and post offices. These vending machines were dispensing stationary and postcards. Since then vending machines have given self-serve access to many different products like candy, cigarettes, condoms, soap, soda, snacks, and laundry soap...
A fascinating study performed in Colorado used sets of twins to tackle the age-old theory of marijuana being a gateway drug, and the findings may surprise you.