L3 Science Week2 Learning Sheet

 The Science Behind the Water Mystery

L3 Learning Sheet - Week 2: Water & Health Systems In the style of Richard Feynman

What People Thought Before

Long ago, people thought: "Clear water is safe. Dirty water is dangerous."

This sounds right. Clear water looks clean. Muddy water looks bad.

But people got sick from clear water too. They didn't know why.

Question: Why does clear water sometimes make people sick?

A Doctor's Discovery :The Story of Dr. Snow

In London, many people were dying from a stomach sickness called cholera.

Doctors thought bad air was making people sick.

But Dr. Snow noticed something. People who drank from one water pump got cholera. People who used other pumps stayed healthy.

The dangerous pump water looked clear and clean!

What Dr. Snow Did:

  • Made a map of sick people's houses

  • All sick people lived near one water pump

  • Told government: "Remove the pump handle!"

  • They removed it

  • Cholera stopped

What He Found: Tiny germs in the water made people sick. You cannot see these germs.

This is just like your village mystery! Clear water had invisible germs.

Scientists Made Mistakes

Mistake 1: Bad Air For 200 years, doctors thought bad air caused sickness. They tried to clean air. It didn't work.

Mistake 2: Smell Test People thought: "If water smells okay, it's safe." But dangerous germs have no smell.

Mistake 3: Taste Test People thought: "If water tastes normal, it's good." But germs and bad chemicals have no taste.

Good News: Making mistakes helps us learn!



Big Discoveries

Discovery 1: Seeing Tiny Life A man built a special glass to see small things (microscope). He looked at the water and saw tiny moving things. These were bacteria!

People didn't believe him. "How can animals be so small?"

Discovery 2: Germs Make You Sick Louis Pasteur proved tiny germs cause diseases. He showed boiling water kills germs.

Discovery 3: Testing Water Scientists learned to test water for bad chemicals.

Nitrates: Chemicals from fertilizer and dirty drains. Too much makes you sick.

Your Mystery Explained Why Athletes Got Sick:

  1. Strange Rain: Too much rain, then stop, then too much again

  2. Open Drains: Couldn't handle heavy rain

  3. Dirty Water Mixed: Drain water went into wells

  4. Invisible Problem: Clear water had germs you couldn't see

The Math:

  • Normal water needs: Your weight × 35ml + extra for playing

  • Fighting germs: Need 40% more water

  • Rohit's mistake: Drank normal amount, but body needed extra to fight sickness

What You Did Like Scientists

You solved the mystery like famous scientists:

  1. Saw patterns (like Dr. Snow's map)

  2. Asked good questions (What kind of water, not just how much?)

  3. Used math (calculated water needs)

  4. Tested samples (sent to lab)

  5. Didn't give up when first ideas didn't work

You are scientists too!

Questions for the Future

These mysteries are still being solved:

  1. Why do germs make some people more sick than others?

  2. How will weather changes affect monsoons?

  3. How much cleaning chemical is perfect for water?

  4. How can we know water will be bad before it happens?

Maybe you will answer these questions!

Your Story Connection

When Manthan said "It's about clean water" - he learned what took scientists 200 years to discover.

When Veer calculated extra water needs - he did math that sports doctors use.

When Chirag tested water samples - he thought like Louis Pasteur.

You think like scientists!

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