Think you're getting a cup that's 100% full of arabica beans? Think again.
Turns out coffee is one grocery staple that's likely to be to have filler ingredients like corn, potato flour, or even soybeans mixed in with your grounds.
Thankfully, scientists have come up with a test to check for those extra ingredients that can otherwise be hard to track.
And that makes for a better cup of joe.
→ Read more: How to Detect the Cheap Filler Ingredients in Your Pricey Coffee from Quartz