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Tiling Shapes Physics Math T-ShirtListwear, an exclusive design collection from Aardvark Dreams, invites friends, family, colleagues, and victims alike to mentally connect the dots on how words and phrases are related. Some are simple, others more complicated and some will torment your friends and enemies alike. This Listwear edition features the three geometric shapes that can be used to tile a plane. This classic unisex jersey short sleeve tee fits like a well loved favorite. The

Its name reflects the complex history of separating chemically similar rare-earth elements

Named for Ytterby

with the symbol Na coming from natrium

making it a research element rather than an industrial material

radioactive

Its signature historical uses included luminous paints and early radiotherapy

school days

water disruption

dog buddies

Its signature use is powerful neodymium-iron-boron magnets in headphones

Elementary charge is the magnitude of charge carried by a proton and the opposite of the electron's charge

Jellyfish blooms are not just a punchline