Maria Gaetana Agnesi, a Milanese woman born into a well-to-do family in 1718, dedicated her life first to scientific and humanistic learning of the highest levels, and then to caring for the poor for which she spent even the last pennies of her hefty inheritance, and gave up the family mansion to live in a humble suite of the Pio Albergo Trivulzio, of which she had been nominated director. She died in 1799, and was remembered two decades later in the bust on the far right on the façade of the Brentano-Greppi mansion at via Manzoni, 6. For more info about her and the palazzo, see my earlier post.
Today, she is honored by Google with a lovely animated logo, catch it while you can.
I snapped this photo on the 2nd of August, 2011, around 3:30-4 PM.