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300tube TED-Ed   7 August, 2017

Download youtube When is water safe to drink? - Mia Nacamulli mp3,mp4,webm,3gp

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Water is refreshing, hydrating, and invaluable to your survival. But clean water remains a precious and often scarce commodity – there are nearly 800 million people who still don’t have regular access to it. Why is that? And how can you tell whether the water you have access to — whether from a tap or otherwise — is drinkable? Mia Nacamulli examines water contamination and treatment. 

Lesson by Mia Nacamulli, directed by Rooftop Animation.