A million things can make my day, 

but if convenience was added to the equation that number splits in two,

lets not for get to subtract the reliability,

factor in the re-energizing preformance of the person or thing,

which all leads to one answer.

Which, didn't have me traveling across the world,

wait for hail, rain or the burning sun, 

wait through hours that turn to days.

I never once had a reason to doubt, its effectivness

it's always there to pick me back up, no matter what life throws.

One look and its contagous positivity, enraptures my world.

The answer is

A sincerely bright smile.

that never fails to lift up my gloomy days.

It reminds me:

That there is still more to the day.

That failure apart of life. 

It gives me:

Assurance, that I will never have to walk alone

Motivation, because of the faith they have in me shines behind those pearly smiles

No matter the obsticales thrown my way,

A sincere smile from those around me 

brighten up my day

becuase every smile reminds me of what I still have.