whats the science behind this?
By digging such pits, people in Arusha, Tanzania, have managed to transform a desert area into a budding grassland. https://t.co/nTRQLkPg9z https://video.twimg.com/ext_tw_video/1827826351975415808/pu/vid/avc1/720x1280/1B5dGBEVznt4XfkS.mp4?tag=12
whats the science behind this?
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