In particle physics, a hadron (pronounced /?hadr?n/, from the Greek: ?δρ??, hadros, “stout, thick”) is a composite particle made of quarks held together by the strong force (similarly to how atoms and molecules are held together by the electromagnetic force). Hadrons are categorized into two families: baryons (made of three quarks), and mesons (made of one quark and one antiquark).

Note that the mass of a hadron has very little to do with the mass of its valence quarks; rather, due to mass–energy equivalence, most of the mass comes from the large amount of energy associated with the strong interaction.

2010.07.22 Thursday ACHK

# Buddha

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Buddha

= the enlightened one

= 開悟的人

— Me@2010.07.22

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Buddha is the one who has realized that he already has (almost) everything he wants.

— Me@2007

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2010.07.22 Thursday $copyright ACHK$

# 傳世之作 2

（安：根據「Dilbert test」，如果一般人也有足夠程度，欣賞你的文章的話，你的文章大概不會是超凡的文章。相反，絕大部人也不懂欣賞的話，你的文章就有可能是傳世之作。）

… 或者是垃圾作品。

— Me@2010.07.20

Intellect is invisible to the man who has none.

— Arthur Schopenhauer

To be great is to be misunderstood.

— Ralph Emerson