Make NGSS come alive with this middle school science story about pollution, engineering solutions, and the human impact on Earth’s systems. Aligned to MS-ESS3-4, The River That Turned Toxic tells the true story of the Yamuna River in Delhi, where sacred waters turned dangerous under the weight of unchecked growth, waste, and industrial runoff — and how science and engineering are now working to restore it. This Story: The River That Turned Toxic Standard: MS-ESS3-4 For thousands of years, the