The World Science Festival opened this week in NYC and runs through Sunday with many different events at venues throughout the city, many are free while others require the purchase of tickets, which are available on-line.
On Sunday the major free event is the Festival Street Fair in Washington Square Park. Follow the link to find list of the events planned for the street fair.
To find out more about the festival itself follow this link to the World Science Festival, which was founded by Brian Greene, a physicist and mathematician from Columbia University, and his wife Tracy Day, a former producer at ABC. The festival was covered/reviewed in yesterday's NY Times .