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Periscope - Wikipedia
Periscope Data by Sisense Executive Team | Comparably
Making a Periscope | NASA
DIY periscope for kids | A periscope is a great tool for your homemade spy gear kit. Rainy day kids' activities: bit.ly/2d8mqx6 | By 5-Minute Crafts | Facebook
Periscope STEM activity - Science Museum Group Learning