How much do you know about caffeine in coffee?

• Caffeine is the most widely consumed psychoactive substance in the world.
• A single arabica coffee bean contains 1.9 milligrams of caffeine.
• A single robusta coffee bean has 2.9 milligrams of caffeine.
• A 250ml cup of arabica filter coffee contains 100 milligrams of caffeine.
• Caffeine levels in coffee vary due to the species of coffee plant.
• Just two varieties of coffee plant make up over 98 percent of the coffee grown worldwide.
• Caffeine runs throughout the entire coffee plant.
• The highest concentration of caffeine is found within the coffee beans.
• Decaf coffee still contains caffeine, but in smaller amounts.
• Amazon has a selection of free goods in their Coffee & Tea section.

How much do you know about caffeine in coffee? Take this quiz to test your knowledge on the world's most popular psychoactive substance. Learn interesting facts such as how much caffeine is in a single coffee bean and why caffeine levels vary in different types of coffee. Discover the truth about decaf coffee and even find out how Amazon's Coffee & Tea section offers free goods. Put your coffee knowledge to the test with this fun and informative quiz.