Today is World Oceans Day! This is a great day to celebrate the world's oceans, but also those who work in this environment and those who work to protect it.

The holiday of environmental awareness, World Oceans Day was first officially recognized by the United Nations in 2008. Celebrate our oceans and spread awareness of ocean-related conservation concerns with this fun holiday shirt, which reads simply WORLD OCEANS DAY within a cute cartoon style image of a colorful reef with a variety of undersea creatures.

Shown here on a women's white t-shirt, it's easy to pick a different color or style of shirt using Zazzle's simple customization tools. 

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Why This “I’m Good with Math” Tee Is an Instant Classic for Engineers

If you’ve ever aced a calculus exam but fumbled the spelling of “engineer,” this funny shirt was made for you.

This “I’m an Engineer... I’m good with math” t-shirt delivers the perfect dose of self-deprecating humor, poking fun at the stereotype we all know is true: engineers are brilliant at problem-solving — just don’t ask them to proofread. With progressively crossed-out misspellings of the word "engineer" leading to the ultimate punchline, this design lands with anyone who lives by the numbers.

For the Left-Brained Legends

Whether you’re designing rockets, writing code, or crunching structural load equations for fun, you deserve a shirt that speaks your language — typos and all. Printed in a casual, handwritten font, this design nails the humor without overcomplicating the joke (engineers appreciate efficiency, after all).

It’s the ultimate go-to for:

• Engineering students

• Professors and lab instructors

• Anyone who thinks Excel is a love language

• Gift-givers looking for a surefire laugh

Great with Graph Paper or a Coffee-Fueled All-Nighter

Soft, comfortable, and smarter than it looks, this shirt is perfect for wearing to class, team meetings, hackathons, or when you’re elbow-deep in a personal project that definitely includes duct tape. It also happens to be a fantastic icebreaker — because every engineer has been there.

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For Space Fans Whose Pulse Races at Every Launch

If rockets make your heart skip a beat, this shirt gets you. Literally.

This Rocket Heartbeat Tee is the perfect mix of science, space, and style — featuring a bold graphic of a rocket ship seamlessly woven into a heartbeat line. It’s a clean, modern design that speaks volumes without saying a word. Whether you’re a budding astronaut, a space program superfan, or just someone who dreams big, this shirt says your love for space runs deep... and steady.

Clean Look, Cosmic Energy

Shown here on a kid's black basic t-shirt, this awesome design can be transferred onto any item in Zazzle's huge catalog, including apparel options for men, women, and babies. The minimalist electric-blue artwork pops off the fabric — a sleek silhouette of a rocket ready for launch, flanked by stylized EKG peaks and valleys. It's a visual pun, a declaration of passion, and a great icebreaker for fellow space nerds.

Ideal for:

• Science fairs and space camp

• Museum trips and STEM events

• Classroom style or everyday cosmic flair

• Anyone whose heart beats for the stars

A T-Shirt That’s Got Heart (and Thrust)

Whether you’re gifting it to a young space explorer or grabbing it for yourself, this tee is proof that science is more than knowledge — it’s emotion, inspiration, and liftoff-level enthusiasm. And with this shirt on, you're always mission-ready.

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Looking for a way to show off your math pride without breaking a sweat? This “Mathletic Department” t-shirt is the perfect mix of nerdy and sporty. With a bold collegiate-style design and the digits of pi (3.14159) front and center, it’s a witty twist on gym class fashion for those who exercise their brains more than their biceps.

Whether you’re a math teacher, student, STEM enthusiast, or just someone who appreciates a smart pun, this shirt is great for mathletes of all kinds. The design is clean, classic, and full of geek-chic energy, making it a great conversation starter in the classroom, at math club meetings, or while out and about. It also makes a fun gift for Pi Day, math competitions, or anyone who knows the only crunches they enjoy come with numbers and logic.

This shirt is all about honoring your brainpower—and maybe poking a little fun at traditional athletics while you’re at it.

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Celebrate your cosmic origins with this sleek and meaningful Recycled Starstuff t-shirt, a design that brings together environmental consciousness and awe-inspiring astronomy. The shirt features a galactic spin on the iconic recycling symbol, filled with a dazzling star field, and the phrase “Recycled Starstuff” below. It’s a nod to Carl Sagan’s famous quote and a reminder that we are literally made of the universe itself.

Whether you’re an astronomy enthusiast, science educator, environmentalist, or just someone who loves a poetic truth, this shirt beautifully connects science and philosophy. It’s perfect for classrooms, planetariums, star parties, Earth Day events, or everyday wear. Comfortable and available in a range of sizes and cuts, it also makes a great gift for stargazers, students, and science lovers of all ages.

This design is more than just a clever visual—it’s a celebration of the natural cycles that make life possible, from the death of stars to the birth of planets and people. Wear it, and proudly remind the world: we’re all just recycled starstuff.

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Who says physics has to be boring? Spark some curiosity—and maybe a few laughs—with this witty Physics Turns Me On t-shirt featuring a classic light bulb graphic above the bold, punny phrase. Whether you’re passionate about electricity, electromagnetism, or just love a good science joke, this tee delivers clever wordplay that’s bound to brighten someone’s day.

Ideal for students, professors, science teachers, engineers, and unapologetic nerds, this shirt is both educational and entertaining. It makes a great gift for physics majors or anyone who lights up at the mention of Ohm’s Law, Coulomb’s force, or Maxwell’s equations. With a minimalist black-and-white design on soft, comfortable fabric, it’s perfect for classroom wear, study sessions, science fairs, or casual everyday fun.

Because let’s be honest—if physics really does turn you on, this is the shirt to prove it.

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