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This is a great holiday t-shirt for math geeks to wear on St. Patrick's Day. The graphic design shows a mathematical-style drawing of a lucky shamrock, along with sketch-style text that reads "Happy St. Patrick's Day." This fun St. Patrick's Day - Math mashup t-shirt is a...

March 6th is National Dentist's Day, a commemorative day to celebrate dentists and their important work. Here are some t-shirts that make great gifts of appreciation for dentists and students studying dentistry.