MICROORGANISMS: Bacteria are everywhere!

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!