2007/07/17 Amanda's A6 speech

A6 speech（The Speech to Inform）
Title: UV, stop!
*Objective:
1. Select new and useful information for presentation to the audience.
2. Organize the information for easy understandability and retention.
3. Present the information in a way that will help motivate the audience to learn.

Props:
(OPEN)a video of domino
When you walk under sunlight without any protection, the UV from sunlight will destroy our skin cells by a chain reaction as the domino show. Day after day, your skin color will become dark, you will have more wrinkles and even more seriously, you may have skin cancer.

(Body)
Does it mean we should stay in the house all the day time? Absolutely not! Part of UV light will trigger some nutrition synthesis in skin, such as Vitamin D. And even if you stay in the house, you still expose to about 50% of UV light.

So what we should do is to put the stopper in the chain reaction! First of all, let's know more about UV light. We can divide UV into three categories, UVA, UVB and UVC. UVC will be absorbed by the ozone layer. And UVA has the weakest energy but will stimulate the production of melanin and tan our skin. The elastin and collagen will lose from your skin after exposing to UVA for a long time. So that you'll have wrinkles and your skin will lose its elasticity. Therefore, UVB will let you get sunburn, stimulate more melanin to produce and dry your skin. So no matter you're male or female, skin protection work is quite important to both of you!

So the targets of sun protection are UVA and UVB. And I will share two strategies with you.

Firstly, choose the right color to wear. According to the research, black clothes will screen out 91% of UV light while white clothes made of the same material will not intercept any UV light. So if you need to walk or drive under sunlight it's better to wear dark color of clothes.

Secondly, apply effective sunscreen. How can you tell effective sunscreen?
1. Read the sun protection label on the production.
SPF means sun protection factor. It's an index of its ability to absorb UVB.
And you can estimate the effective time of the sunscreen by this formula:
The time your skin getting inflamed without any protection × SPF factor
Some people will use fifteen minutes multiply SPF factor as a rough estimation.
PA means Protection Grade of UVA and can represent its ability against UVA.
PA+ means slightly UVA interceptive.
PA++ means medium UVA interceptive.
PA+++ means highly UVA interceptive.
So it'll be better to select PA+++ sunscreen if you need to do outdoor activities.
2. Find the effective composition.
It's the most important point for selecting sun block. There are two major types of the effective compositions.
(1) UV scatter: They will reflect UV, such as TiO2 and ZnO.
(2) UV absorbent: They will absorb UV, such as Cinnamates, Salicylates and Benzophenones.
Please check the ingredient of your sunscreen to make sure the effective compositions are included. Or it won't protect you from UV light even if it's very expensive.

(CONCLUSION)
Come closer! Come closer! You can come much closer! Would you like to look as young as me? You don't need to buy the expensive SKII. Just protect your skin by the right way! UV, stop!