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You probably see this kind of Ad thousand times.  What do they tell you?
What does it mean for investment?  

The very and valued thing here is the data or three months.  It is definitly statistic data
that show how long mass people to remember in the moder scocity.  In reality, the time is
much shorter than 3 months maybe for only 1 month.

Do you try it?  how?  Take a notes first then forget about it.  After you even cannot tell,
try remember how long ago you wrote before you see the answer.