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Art and science workshops, interactive gallery activities and pop-up storytimes, Monday, Feb. 20 from noon-5 p.m., through Feb. 24. Also, free planetarium shows at 12:30, 2 and 3:30 p.m. Children must be accompanied by a caregiver. Free with admission: $10 for adults, $7 for students and seniors, $6 for ages 3-18, free for members and children under 3. Hudson River Museum, 511 Warburton Ave., Yonkers. hrm.org.