1. Introduction

Background Information
Most people drink many cups of teas in their lifetimes. Teas help to keep us awake by allowing us to be able to stay awake. However, it is not the tea that boosts our senses but the caffeine in the tea that allows us to stay awake.  According to a Chinese legend, it was a Chinese Emperor Shennong that had accidentally found out and discovered about teas when a certain kinds of leaves fell into boiling water and resulting in a creation of a fragrant and restorative drink. And soon the news spread like wildfire, as more and more people started to knew about the accidental creation of the fragrant tea.
Caffeine is a substance found in quite a lot of drinks, such as coffee, tea, coke etc (WebMD,nd). It is also a bitter, white crystalline xanthine alkaloid and a stimulant drug. In the human body, it acts as a stimulant to the central nervous system, which would temporarily ward off drowsiness and restore alertness (Helian Books, 2014). Caffeine can be used to treat migraine headaches when combined with painkillers and ergotamine,asthma, gallbladder disease, attention deficit-hyperactivity disorder (ADHD), shortness of breath in newborns, and low blood pressure (WebMD,nd).

In US, a study of 7th, 8th, and 9th grade students in Ohio found that students took in an average of 53 mg of caffeine per day, but almost one in five students took in more than 100mg of caffeine each day (FDA,2007). Caffeine changes how our body and brain works, how we behave and feel (FDA, 2007). However, it can cause us a lot of problems such as getting not enough sleep, headache, rise of blood pressure, etc (FDA, 2007).

Not only that, caffeine increases the acid in our stomach, resulting in upset of stomach and also make us lose more water (FDA,2007). Studies shows that moderate amount of caffeine is not harmful and the moderate amount is 100 to 200 mg per day according to doctor’s suggestions (FDA, 2007).  However, caffeine affects people varies with their size, their gender, and how sensitive they are to caffeine’s effects (FDA,2007). Caffeine overdose is dangerous and can kill you (FDA,2007). Different amount of caffeine will affect different people differently and we must be aware of our intake of caffeine ( FDA, 2007).

Research Question
Which type of tea have the most amount of caffeine?

Based on these variables, we have created the hypothesis for our experiments:
If we use Earl Grey Tea, the amount of caffeine attain will be the highest.

Independent Variable
The different types teas used to test for caffeine

Dependent Variable
The amount of caffeine in the different teas

Controlled Variable
The volume of tea used to test for caffeine
The length of time taken to boil the tea bags
The number of tea bags used

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