Happy T-Shirt Tuesday!
Every week on the day after Monday, we're debuting a new t-shirt in the mental_floss store. Today we have not one shirt, but two: Hedgehogs Can't Share (above) and Pi Be Rational.
And that's not all! Today is the last day to get free shipping on your order of $50+. Use code GOTTAHAVEIT at checkout, and hurry—the sale ends at midnight!