It’s quite astounding, when you think about it, the amount of intelligent design that went into creating the world that we live in today. 
Almost everything that you use on a day-to-day basis during your life was painstakingly conceived, designed and created by a bright-spark that lived on this earth at some point during its existence.  Everything, from that chair that you sit on to the big nuclear power station that gives life to your computer, various people had to invent and think our entire modern world up. 

Because of the incomprehensibly vast number of inventions that constitute our pleasantly comfortable life on earth today, it is most difficult to pick a single, best, most important one out of the lot.  I mean, just think what life would be like today if Sylvanus Bowser had forgotten to invent something as dull and monotonous as the petrol pump… We might still be galloping around on horses today! A scary thought indeed.

Luckily however, I don’t have to pick the best invention, but rather I can be as subjective as I want, and pick out my favourite invention!  Ah well, in that case the question changes to what invention provides me directly with both fun and a decent amount of practical use.  The answer is of course a simple one (from the perspective of a teenager); it’s the cell-phone! 

Yes, they are amazing little things aren’t they?  You can rig them up to your PC and surf the web from anywhere in the world, take videos or pictures of incredible quality, send and receive emails, hear the sweet words “you have reached you destination” with GPS, draw-up Word documents or Excel spreadsheets, listen to your best songs or watch videos on the go and send SMS’s, MMS’s IMS’s and EMS’s. Oh, and you can make phone calls (or video conference calls if that takes your fancy). 
Now you can even code your own software and applications for your phone to make it do exactly what you want it to!  The potential is virtually limitless. 

It will be difficult to find a more useful, fun tool than the cell-phone.  Although (as my phone beeps at me from my pocket), if someone could please invent a battery that will last for a month without needing to be charged, that will certainly be a contender.

Bye for now.