Reading comprehension is the most difficult part of

all language skills. Although I can pass most language

tests with perfect scores, I still feel not the same easiness

when I use foreign language as when I use chinese. This is

why I can go through almost all of the sources of chinese media

and read whatever I feel interested, no matter how many there

are, I can finish each day. However, I can only read one piece

of foreign language work every one day.

So when I learned that someone can have more foreign language

reading comprehension ability than native language users, it is really

strange. Anyway, you can have it and believe it.

Comma, who are you? About how to use it, the comma.

In blog: Something About Photons, there is the phrase:

spin angular momentum obital angular momentum,

you can add a comma between momentum and obital,

both are correct.