50% off storewide closeout sale!

This is a going-out-of-business sale. This was started as a family business, and since my divorce several years ago, my heart hasn't been in it. So I'm moving on.

Everything is 50% off, while it lasts! The discount happens as soon as you put something in your cart.

Several designs are completely sold out and no longer available, and most shirts have sold out in one or more sizes.

Click here to see shirts listed by sizes that are still available.

Click here for for Women's shirts sorted by available sizes.

Click here for for Youth shirts sorted by available sizes.

Orders over $200 get a 15 percent discount and free USA shipping; orders over $400 get a 20 percent discount and free USA shipping.

Adult 2XL

Products

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FIBBOOO Fibonacci Series T-shirt (2XL Only)
Size 2XL only.

The Fibonacci series (0, 1, 1, 2, 3, 5, 8, 13...) applied to the letters of Fibonacci's name (except that we skipped the zero). T-shirt is Black.
Currently available only in size 2XL. $16.

Apple Pi T-shirt (2XL, 4XL)

What do you get when you divide the circumference of an apple by twice its radius?
Apple Pi.

Price: $20.

Dare to be Differential T-shirt

Front: Know Limits
Back: Dare to be Differential

Available in Stone Blue, Ash Gray, White, and Yellow.

Price: $20.

Math to the Limit Calculus T-shirt
Printed on Front and Back. Available in Men's & Women's sizes.

Front upper left chest: Mathematical notation for "Limit as x approaches infinity of 1/x to the n"
Back: "Take Math to the Limit" accompanied by graph of f(x)=1/x2.

Available in Black, Navy Blue, Ash Gray, Cedar Red, and Metro Blue, depending on size.

Price: $20.

SCIENCE! T-shirt
Comes in Adult and Youth sizes.

"SCIENCE!" spelled out using the shapes of various science-related items.

Price: $20.

Warning Engage Brain T-shirt
Printed on Front and Back

Front upper left chest: Stylized "Think" logo.
Back: "WARNING: Engage your brain before opening your mouth. In case of malfunction or loss of control, stop, back up, and try again."
Available in Ash Gray, White, or Yellow.

Price: $20.

Calculus Rules T-shirt (2XL, 4XL only)

Product Rule, Chain Rule, Quotient Rule . . . Calculus Rules!
Currently available only in 2XL, 4XL. Black or Ash Gray. $20.

Derivers Wanted Calculus T-shirt (Small, 2XL, 4XL)

Available in Black or Indigo Blue. Available in 2XL and 4XL, and in Long Sleeve Black Small. Also, one Blemished Medium.

Price: $20.

Infinity T-shirt
Available in Men's and Women's sizes.

Front upper left chest: Infinity symbol surrounded by the words "Contemplate the infinite"
Back: "With Math, The Possibilites Are Infinite"

Available in Men's Small, Medium, and 2XL; in Women's Black Extra Small, Large, and XL.
Price: $20.

Carbon Based T-shirt

Carbon Based and Proud of It! Show your pride at being a carbon-based life form.
Black or Indigo Blue.

Price: : $20.