9th grade students

9th graders 'turn' air conditioner waste into drinking water
The plastic pipe manufacturing system of the 9th grade students in Saigon can turn wastewater from air conditioning, rain water, into drinking water.
The 9th grade student invented a mosquito repellent from tea residue
Being bitten by mosquitoes during the lesson, the 9th grade student created a mosquito repellent completely with 'homegrown' and won a high prize in creative competitions.