The Girl Who Tested The Water
How do you find something invisible in water?
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The story
Gitanjali Rao read about lead in drinking water and decided 11 was old enough to help. In the USA in 2017 she built Tethys, a small sensor that reacts to lead and sends the result to a phone, turning a slow lab test into a quick check anyone could do.
What you'll learn
- Some pollutants like lead are invisible and tasteless in water.
- Sensors can detect chemicals by measuring tiny changes in electricity.
- Gitanjali was 11 when she invented her lead detector.
- Kid takeaway: if a test is too slow for people to use, invent a faster one.
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