我的试验室 My Lab

This question has been in my mind for quite some time.  Silly me, the fact behind is so simple...  I would like to share the explanation with you in the link below:

http://www.yourmortgage.com.au/article/fortnightly-vs-monthly-repayments-78306.aspx

It is very clear and easy to understand. 

Please let me know if it is incorrect.

Last Friday, did you watch Today Tonight?  There was this visual artist who took a daily picture of a McDonald's Hamburger for 180 days.  And, after 180 days, other then the size has shrunk and the moisture has disappeared, the hamburger and the meat patty are still 'intact'.  No mould, no nothing!!
http://au.todaytonight.yahoo.com/video#   Go to 'Happy Meals'

Just now, in Today Tonight again, we have been consuming too much salt in our diet.  Absolute maximum daily intake of salt should be just a little more than 1 teaspoon only.
http://au.todaytonight.yahoo.com/article/8155173/none/salty-shock

I don't think anybody can control within that level unless you are having home cooked meal with lots of homemade food, veggies and fruits.

As everybody knows, homemade food is the best. However, how many of us can include fully or even partly homemade diet in our daily life? i.....

I have been reading some articles about cooking oil.  However, all of them have different suggestion. I find attached links are rather informative eventhough there is slight contradiction between two of them.
 
http://bbq.about.com/od/grillinghelp/a/aa061607a.htm
http://www.culinary-yours.com/frying_oil.html

I am using extra light olive oil. Sometimes I alternate it with canola oil.  The reason for the alternative is, I simply do not have confidence to stick to only one type of oil.

How do we find out whether canola oil is refined or not?  And, when you read the label, it even contains trans fat.  This means it is not pure, and this means the smoking point is lower than the refined one?  Then, why do some doctors still recommend diabetics to use canola oil?  Do they mean refined / pure canola oil?  How to get the pure canola oil then?  A friend of mine whom has been using olive oil for her home cooking changed totally to canola oil after listening to the doctor's advice when she found out that her husband is a diabetic.

Do you have any information/ advice to share in this matter?  You are most welcome to post your idea here....  Perhaps, we can come to a conclusion?!

The truth is should be out there :-)