An Invention Has Changed The World----Glass

(This is an essay I prepared for my English speech contest.  I Hope you can help me to make it better. Thank you. :) )

I guess everybody has experienced this scene before: You are amazed by the specimen under the window of glass.  When you were surprised by the animal’s beauty via glass, did you care about how slender the glass seems? 

3000 years ago, some European boatmen occasionally first discovered this mysterious thing.  Pot’s holder containing primary soda, quartz sand, in the function of fire, dissolving into a new crystal.  This was the original glass.  About the 4th century, Romans started to use glass to make windows.

After developing for thousands of years, today’s glass is used in more creative fields.  For instance, Vacuum Glass can release noise and adjust the indoor temperature. 

The world is full of miracles.  Inventions are renewing everyday.  Glass, as a great and versatile invention, is playing an important role in our life.  And, it can’t be replaced.

I helped you quite a bit here, but you still need to work on it.  What is pot's holder?  Also, what do you mean when you say:  in the function of fire?  You need to figure out a better way to phrase that.  Also, you could say a little bit more to make this a great paper.  Also, be sure to put 2 spaces after a period before you start your next sentence.