WHY DO I NEED TO WASH MY HANDS IF THEY SEEM TO BE CLEAN?
MATERIAL:
- our hands and our face
- 7 Petri dishes
- bacteria's food
- soap and water
- sellotape
- heater
WHAT DID WE DO?
- First, we need six volunteers
- All of them wash their hands
- Then, student 1a and 1b, without touching anything, they touched the bacteria's food in the Petri dish 1a and 1b.
- Later on, student 2a and 2b touched their face and then touched the bacteria's food in the Petri dish 2a and 2b.
- Afterwards, student 3a and 3b touched everything around them, everything they usually touch and they touched the Petri dish 3a and 3b.
- We didn't touch the Petri dish numer four.
- Finally, we closed them with Sellotape
- We put the Petri dishes on the radiator and we wait three days.
RESULT:
1a and 1b: There's nearly anything in the Petri Dish
2a and 2b: We can see yellow dots: there're bacteria!
3a and 3b: We can see lots of yellow dots: there are more bacteria!
4: Nothing happened.
CONCLUSION:
There's bacteria everywhere
We have to wash our hands before eating!
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