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RHS Photographic Competition 2021 Image source: The Royal Horticultural Society +2 weeks remaining Free
National Space Society Settlement Contest 2021 Rick Guidice's cutaway view of a toroidal space colony, part of the space colony summer studies conducted at NASA Ames in the 1970s. +4 weeks remaining Free
Science Without Borders Challenge 2021: The Magic of Mangroves Copyright: Khaled bin Sultan Living Oceans Foundation +1 month remaining Free
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31st World Festival of Animated Film – Animafest Zagreb 2021 Image source: Animafest +2 months remaining Free
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