According to a survey by the economist Ofer Azar, the absolute size of tips in the US is overwhelmingly dependent on the size of the bill.

经济学家奥费尔·阿扎尔(Ofer Azar)的调查发现，在美国，小费的绝对金额在很大程度上取决于账单金额。

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According to the X-ray I had all dark spots on the tips of my lungs and the doctor thought that I must have suffered from pleurisy at one time.

根据X光照结果，我的肺尖全都是黑斑，医生认为我曾患有胸膜炎。

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But according to a new research from Cornell University, tips no longer serves any useful function.

但据康奈尔大学一项新的研究表明，小费已不再起任何作用。

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According to a handful of tips we've received this morning, Best Buy has been sending out emails to users who pre-ordered the new tablet for delivery this week, informing them that shipments have been "back-ordered, " and delayed by one to two weeks.

ENGADGET: ASUS Transformer Prime pre-order shipments delayed at Best Buy, Amazon

They continued to use the UBS analyst tips to trade, according to the SEC.

FORBES: Magazine Article

Another good bet for a 529 would be Treasury Inflation-Protected Securities (TIPS), which currently return approximately 3% plus whatever the inflation rate turns out to be. (Currently, that works out to a combined 5.5%, according to Vanguard's John Hollyer.) Unfortunately, the only 529 investors with access to reasonably priced TIPS are residents of South Dakota, who can buy into a Pimco TIPS fund with no load.

FORBES: Investment Guide