@DrPetra check out https://t.co/VYSGaHKocO and Teachers' resources https://t.co/USyAZgpOLl
— ESA (@esa) October 22, 2016
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@DrPetra check out https://t.co/VYSGaHKocO and Teachers' resources https://t.co/USyAZgpOLl
— ESA (@esa) October 22, 2016