We celebrate Pi Day each year on March 14, because 3.14 are the first digits in Pi. Pi is a mathematical constant that represents the ratio of a circle's circumference to its diameter. Pi is actually an irrational number, meaning it is an unending, patternless decimal.  Pi is often...

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.