“I’m in denial, you know?” Bob Bright, MIT Medical’s director of facilities, usually loves spring on campus, but this year, the bright yellows and greens of the daffodils and budding trees are muted; Maria Bachini, facilities coordinator at MIT Medical and Bright’s colleague of 20 years, is retiring on April 29. Although Bachini has worked with Bright for a long while, it only represents a fraction of her overall time at the Institute — which has spanned just shy of 57 years. In these days of freelance work and the…