<https://fr.coursera.org/lecture/water-part-2/video-4-1-information-treatment-case-1-in-house-water-quality-testing-LUDcN#lecture>
<http://schema.org/thumbnailURL>
"https://d3c33hcgiwev3.cloudfront.net/imageAssetProxy.v1/t28KK74fEeajLxLfjQiSjg.processed/thumbnails/720p/0.jpg?expiry=1635206400000&hmac=LR0M8uk6YLoSoH6JrXcIWeEUTznvwYI53-jJ8QgverQ"
<https://fr.coursera.org/lecture/water-part-2/video-4-1-information-treatment-case-1-in-house-water-quality-testing-LUDcN>