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Wednesday, July 23: Touch tank

Touch tank: Children of all ages touch a starfish, a horseshoe crab, or a sea snail. Free with museum admission. 11:30 am–12:30 pm and 2:30–3:30 pm. Brooklyn Children’s Museum, 145 Brooklyn Ave. at St. Marks Avenue, (718) 735-4400, www.brooklynkids.org

Wednesday, July 23: “Anatomy of a Powerhouse: Electrifying the El”

“Anatomy of a Powerhouse: Electrifying the El”: Archival photo exhibition showing construction and early operation of the 74th Street Powerhouse. $7 ($5 for children 2–17 and seniors, free for members and children under 2). 10 am–4 pm. New York Transit Museum, Boerum Place at Schermerhorn Street, (718) 694-1600, www.mta.info/mta/museum

Wednesday, July 23: “Ai Weiwei: According to What?”

“Ai Weiwei: According to What?”: The first North American survey of the work of the provocative Chinese conceptual artist, sculptor, photographer, filmmaker, and activist. $12 (suggested). 11 am–6 pm. Brooklyn Museum, 200 Eastern Pkwy. at Washington Avenue, (718) 638-5000, www.brooklynmuseum.org

Wednesday, July 23: Farmers Market

Farmers Market: Get fresh fruit, baked goods, yummy veggies and tons of vendors. Free. 10 am – 5 pm. Marcy Plaza, @@Fulton St. and Marcy Avenue@@,

Wednesday, July 23: Pop-Up Pool

Pop-Up Pool: Jump in the water is fine. The 30 by 50 foot pool includes a sandy beach and play area with food and drinks from Lizzmonade and swim lessons available. Free. 10 am–6 pm. Pier 2 Uplands, @@Furman St. and Columbia Street@@,

Wednesday, July 23: Cosmic Yoga

Cosmic Yoga: $15. 10 am, Noon, 7 pm. Body Actualized Center, 143 Troutman St. between Central and Evergreen avenues, (347) 770–1437, bodyactualized.org

Wednesday, July 23: Play Streets

Play Streets: The Police Athletic League is providing a safe environment for children to play in. Free. 9 am – 5 pm. Kelly Playground, @@Avenue S and E. 15th Street@@, , Http://www.palnyc.org