It's a lazy Saturday morning and you've just finished pouring the last of the coffee into your mug when your significant other informs you they were hoping to have a little more coffee, too. Being the generous person you are, you pour half of your fresh coffee into their mug...only to dribble coffee all over the counter and the floor. Why is it so hard to pour liquid from a mug? A physics principle known as the Coanda effect is to blame for the mess in your kitchen, but it's not all bad — it's also the reason airplanes can fly.
I Believe I Can Fly
Don't Cry Over Spilled Coffee
Demonstrations of the Coanda Effect
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