Bright, cute, and colorful, Post-Its are the little sticky paper squares we never knew we needed. Since 1980, Post-Its have paved the way for office messages, grocery lists, study notes, and even promposals, all thanks to the efforts of two 3M company inventors: Art Fry and Spencer Silver. This month, Spencer Silver passed away at the age of 80 in his Minnesota home. He is survived by his wife of 56 years, Linda, their daughter Jennifer, two grandchildren, and the billions of Post-Its in offices, schools, and homes around the world. Early Life and Education Spencer F. Silver, known…