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</html><thumbnail_url>https://www.teachonmars.com/wp-content/uploads/2019/10/callisto.jpg</thumbnail_url><thumbnail_width>700</thumbnail_width><thumbnail_height>338</thumbnail_height><description>[et_pb_section fb_built=&#x201D;1&#x2033; admin_label=&#x201D;section&#x201D; _builder_version=&#x201D;3.22&#x2033;][et_pb_row admin_label=&#x201D;row&#x201D; _builder_version=&#x201D;3.25&#x2033; background_size=&#x201D;initial&#x201D; background_position=&#x201D;top_left&#x201D; background_repeat=&#x201D;repeat&#x201D;][et_pb_column type=&#x201D;4_4&#x2033; _builder_version=&#x201D;3.25&#x2033; custom_padding=&#x201D;|||&#x201D; custom_padding__hover=&#x201D;|||&#x201D;][et_pb_text admin_label=&#x201D;Text&#x201D; _builder_version=&#x201D;4.0.5&#x2033; background_size=&#x201D;initial&#x201D; background_position=&#x201D;top_left&#x201D; background_repeat=&#x201D;repeat&#x201D;] Late 2019 sees the release of Callisto, one of the most significant steps forward for the Teach on Mars solution since its creation. Callisto has been built to reinforce the human dimension of mobile-led learning, placing the [&hellip;]</description></oembed>
