## Introduction: Dhahran Ahliyya Schools Sience Fair

My name is Hatem Alkaka, I'm in Dhahran Ahliyy Schools MYP 2, and this is my science fair project.

## Step 1: My Problem/purpose:

My problem or purpose for my science fair project is for me to know if the dominant hand is more or less sensitive than the non-dominant hand. My question is: Does the dominancy of your hand affect its sensitivity?

## Step 2: My Hypothesis:

My hypothesis for this experiment is if you put both hands into ice-cold water, then your non-dominant hand will come out first due to the coldness; Exp: If you are right-handed then you will pull out your left hand first. This is because of your non-dominant hand isn't used as much so it doesn't have much of a tolerance to pain and exhaustion.

## Step 3: Variables:

Independent variable: The dominancy of the hand

Dependent variable: The amount of time each hand can spend in the cold water/ which hand is pulled out first.

Controlled variable: The temperature of the water/ the age range/ the size of the bowl.

## Step 4: Backround Reaserch:

In human biology, handiness is a superior, quicker, or more reliable performance or individual preference for using a hand, known as the dominant hand. The hand which is unfit, less competent or less favored is called the non-dominant. Right-handedness is the most common type, and approximately 90 percent of the world's population is estimated to be right-handed. Handedness is also characterized by the hand that people write, eat, ore plat with. And rarely there are people that are mix-handed ( or ambidextrous) that are capable of using both hands efficiently.

## Step 5: Materials:

• Timer
• 5 people ( 2 left-handed/ 2 right-handed/ 1 fairly ambidextrous)
• Water
• Enough ice to suit the water
• A bowl

## Step 6: Procedure

1. Put enough ice into a bowl of water to make it extremely cold.
2. Let one person put both his/her hands into the bowl
3. Record when (s)he takes out each hand.
4. Repeat steps 2 and 3 for all the people.

## Step 7: Data

Right-handed:

• Left hand out first and they were 6 seconds apart (23sec-29sec)
• Left hand out first and they were 10 seconds apart (20sec-30sec)

Left-handed:

• Right hand out first and they were 4 seconds apart (18sec-20sec)
• Right hand out first and they were 7 seconds apart ( 25sec-32sec)

Ambedextourus

• Right hand out first but they were 2 seconds apart (25sec-27sec)

## Step 8: Data Analysis

• All the left-handed people pulled their right hand out first and vise-versa
• The average gap between the two hands for right-handed people was 8 seconds.
• The average gap between the two hands for left-handed people was 5.5 seconds.
• The average time every person in the experiment could handle is 24.9 seconds

## Step 9: Results

The results I got after conducting this experiment is that every person that I did form different ages all pulled out their non-dominant hand out of the water first because they could not handle it. And the only ambidextrous person pulled out his right hand first.

## Step 10: Conclusion

In conclusion, my hypothesis was correct in which I managed to determine whether or not your dominant hand is less sensitive to the cold temperatures than your other hand. After analyzing my data I realized that every person (excluding the ambidextrous person) pulled out their non-dominant hand. And since the ambidextrous person pulled out his right hand. That could mean that he was originally left-handed.

## Step 11: Application

Left-handedness/ right-handedness can be an important part of future studies to understand more about the human body. Soon, if we dive deeper into the knowledge of what makes us left-handed an right-handed, we could be able to connect it to brain function, and performance abilities.

## Step 12: Evaluation

I have used self-management skills during the whole process of this experiment. This is because I have organized a timeline for my experiment dates and followed it accordingly. I planned everything Ill need for the experiment beforehand. And I made sure that I finish it all on time.