nearly half of the Exhibit Halls from 2012, and open three new major exhibits: the Hall of Human Life, the Yawkey Gallery on the Charles River, and What Is Technology? The Hall of Human Life opened in November 2013 in the newly expanded Level 2 of the Green Wing, and has a focus on human biology. The audio kinetic sculpture Archimedean Excogitation has been moved to the atrium to make way for a new exhibit in the lower lobby called The Yawkey Gallery on the Charles River. This exhibit opened in 2016, creating a new entry to the museum with better views of the Charles River and Boston-Cambridge skyline. On October 18, 2016 former mayor of New York City Michael Bloomberg revealed that his foundation, Bloomberg Philanthropies, is donating $50 million to the museum, the largest gift in the institution's 186-year history. The museum also opened Wicked Smart: Invented in the Hub, an exhibition of new technologies, especially those created in or around the Boston area. This new exhibit also contains a few interactive activities, including a novel type of wheelchair which visitors can sit in and maneuver. A large-scale interactive digital video projection devised at the MIT Media Lab using sensors from an Xbox Kinect, is very popular with visitors, who can control complex visual displays by means of body gestures and motions. Exhibit halls Blue Wing Butterfly Garden: a walk-through greenhouse containing exotic butterflies with an area dedicated to botanical education Seeing is Deceiving: a collection of optical illusions, including many motorized illusions Making Models: exhibit on the use of physical and abstract models to understand the real world Mathematica: A World of Numbers... and Beyond: a roomful of classic mathematical exhibits by designers Charles and Ray Eames Natural Mysteries: an investigative exhibit on classification of mysterious objects and natural history specimens Theater of Electricity: features the world's largest air-insulated Van de Graaff generator, designed by Professor Robert J. Van de Graaff and donated by MIT in 1956. Demonstrations of "artificial lightning bolts", Tesla coils, and other electrical apparatus Math Moves!: Experiencing Ratio and Proportion: an immersive exploration of math and proportion including the former exhibit, Clark Collection of Mechanical Movements: over 100 working models of mechanical motions and linkages Innovative Engineers: exhibits and brief biographies of Boston engineers, including minorities and women Investigate!: a house-sized collection of rooms to explore using scientific thinking Energize!: exhibits of renewable