Is the glass half empty, or half full? An optimist and a pessimist allegedly would have different answers, but in reality, the glass is always completely full, as this funny science geek t-shirt explains.

This graphic design shows a simple glass of water. The half that is full of water is noted, as is the other half which is full of air. Thus, technically, the glass is always completely full, not half of anything. This funny, sarcastic science-based t-shirt is a fun gift idea for those who follow knowledge!

See below for other fun graphic takes on this geeky trope. Most of these shirt designs can be purchased on a different colored shirt from the one featured, so you can pick the color that works best for you!

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This fun t-shirt features text surrounding an illustration of an atom with a cute red smiley face inside. The text, in white and red, reads in all caps: Never Trust an Atom | They Make Up Everything. A truer statement there never was. 

This funny science geek t-shirt is available in black as shown as a unisex crew neck. There are more options below. For this garment, choose from sizes XS to 3XL. 

This shirt is made of comfortable and soft 100% ringspun cotton.

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The abacus is an ancient form of calculating tool also known as a counting frame. While the exact origin of the abacus is unknown, early frames probably didn't include letters formed in the QWERTY keyboard style as seen on this shirt.

The abacus t-shirt design here features a fantastical abacus framed inside of what looks like a computer monitor. There is even a corded mouse attached to the frame. The rows of beads, used to represent numbers on an abacus, appear here with numbers written on them, as well as letters as you'd find on a modern QWERTY keyboard. 

This QWERTY B.C. t-shirt is fun for math nerds, computer geeks, and others interested in the abacus and its different forms. Available from Zazzle, this design can be purchased on a huge variety of apparel styles and other novelty gift items in Zazzle's catalog.

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Newton's law of universal gravitation, sometimes called Newton's law of gravity, is a mathematical equation that relates force between objects, mass, and distance. The formula is presented on this t-shirt within an illustrated apple -- alluding to the story that Isaac Newton was inspired in his work by watching an apple fall from a tree, or when an apple fell on his head.

This fun graphic t-shirt design with Newton's law of gravity in an apple shape is the perfect gift idea for a math or science teacher. The bold design features a real world equation that will inspire students. 

Get this unique science geek apparel design on a white tee as shown, or pick a different apparel style or color to suit your recipient.

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This funny astronomy spoof shirt is great for anyone interested in studying the stars and space. The design features a book with planets and stars seeming to jump off the pages. The book and planetary bodies is part of a tarot card inspired design. The book and astronomy icons are shown within a shape held by cradling hands. The design is captioned with THE ASTRONOMER.

This is a fun gift idea for astronomers of all levels, including students, amateurs, scientists, and anyone else interested in the field. It's especially perfect for those who might also have an interest in gaming, magic, tarot cards, and/or the mystic arts.

Shown here on a unisex casual t-shirt in asphalt grey, this top can be purchased in cuts for women as well, in a variety of different colors. Different apparel styles are also available; see some options below.

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This diagram, the Bloch sphere, was named after the Swiss physicist Felix Bloch. It is a geometric representation of the pure state of space of a single qubit, used in quantum mechanics and computing. 

I have no idea if any of that made sense, but this simple graphic t-shirt is a best-seller and we wanted to highlight the simple design for anyone who works in the field.

Shown here on a basic black t-shirt, this simple graphic design in white can be purchased on a huge variety of different apparel colors and styles, depending on your preference. With Zazzle's easy tools, you can even purchase this design on virtually any product in their vast offering -- just look for Transfer Design to a product on the t-shirt's page. 

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