On Saturday, September 28, the Waterfront Alliance will host “Climate Science in the Sand” on Brooklyn Bridge Beach (on the East River waterfront beneath the FDR Drive, near Dover Street), from 1:00 to 5:00 pm. In addition to offering rare public access to a shoreline that is normally closed, this educational family workshop will feature kid-friendly activities that showcase the past, present, and future of the local waterfront. Admission is free and children (along with their parents) are encouraged to drop by for any part of the afternoon-long program, which will include measuring the low tide (at 2:49 pm) with a flood yardstick, testing the water temperature, and gauging the pH balance of the river. There will also be talks about how warming waters and ocean acidification are affecting New York, and the world. (This program will proceed rain or shine. Closed-toed shoes are required for access to the beach.)