Health/Science Calendar

Hispaniola observed The Harvard Museum of Natural History will hold a free lecture by Dominican-based conservationist Eladio Fernandez about his photography and research on the Caribbean island of Hispaniola, which includes Haiti and the Dominican Republic. Begins at 6 p.m. Call 617-495-2773 or go to hmnh.harvard.edu.

Videocast with dolphins The Museum of Science will present a live videocast from the Bahamas with Dr. Kathleen Dudzinski, who will discuss her research on dolphin communication. Begins at 11 a.m. Free with exhibit halls admission. Go to mos.org.

Asteroid watch Brian Marsden, director emeritus of the Minor Planet Center, will talk about the possibility of an asteroid hitting Mars later this month. The Harvard-Smithsonian Center for Astrophysics lecture begins at 7:30 p.m. in the Phillips Auditorium, 60 Garden St., Cambridge, with stargazing to follow, weather-permitting. Go to cfa.harvard.edu/events.

Studying stem cells WGBH will air a new independent film about the discoveries and challenges of stem cell research. The program airs at 9 p.m. on Channel 44. Go to wgbh.org. Events may be sent to healthscience@globe.com