The procedure you need to follow is the scientific method. Ask a question or state a problem you want answered. Then, do research about what is known on the topic. Formulate a hypothesis--a possible answer to your question. Design and perform a controlled experiment. Do data analysis and come up with conclusions. Share out your findings. What about something to do with obesity in young people? That is a very important issue these days.
my one is very easy to make, still you can log on to www.youtube.com
Which grade do you read in?
You can make many things in your science exhibition -
I have made millions of them -
If this is your first experiment, build a wind mill that can generate electricity -
The steps are -
Get a propeller and make a stand to fix in propeller.
After fixing the propeller in the stand -
Attach a motor to the propeller -
You don't have to bring a battery -
Now, attach the two terminals of a LED bulb to the two terminals of the motor.
Your device is almost ready -
Bring a small table fan -
It is done -
Take your device in the exhibition hall,
Place your wind mill face to face to the table fan, now you "on" the fan.
Mission Accomplished -
Your propeller will rotate and the LED bulb will glow -
This is wind energy converted in to rotational energy and rotational energy is converted into electrical energy!!