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Why Can't We Drink Ocean Water?
A TED-Ed lesson on why seawater is dangerous to drink. Learn how salt affects your body's cells, why drinking seawater makes thirst worse, and how removing the salt (desalination) creates fresh water.
How it works
- Press play to start the video.
- Videos 5 minutes or longer pause once or twice for a quick check. Get it right and you're on your way. If not, you'll see a friendly explanation and the video simply keeps going. Short videos skip the checks.
- At the end there's a 3-question test. Score 60% or more to complete the lesson, and 80% or more to master it. You can always watch again and try for a higher score.