Issued by the Brazilian Treasury, the LFTs are fixed income securities, whose yield changes with variation of the Selic rate.

FORBES: Brazil Lowers Interest Rates, But Risks Remain

He suggested it was possible that "natural variation" in the rate of cot death could be responsible for the vast improvements seen around the time the new advice was introduced.

BBC: NEWS | Health | Infant death 'doubts' challenged

An ideal one would keep the same rate regardless of variation in power supply, temperature, air pressure, magnetic fields, or any other disturbing influences.

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The fact that there is a lot more variation than usual in the rate of return you can earn investing in different parts of the economy also backs up his case.

BBC: The UK productivity puzzle (cont'd)

Checking data collected at Brookhaven National Laboratory on Long Island and the Federal Physical and Technical Institute in Germany, they came across something even more surprising: long-term observation of the decay rate of silicon-32 and radium-226 seemed to show a small seasonal variation.

FORBES: Radioactive Decay Rates May Not Be Constant After All

In fact, changes in discount rate expectations account for about 100% of variation across most securities and markets.

FORBES: John Cochrane's Unpleasant Fiscal Arithmetic

According to recent reports, the Nepal Living Standards Survey 2010-2011 (NLSS- III) has found out that Nepal has an adult literacy rate of 56.6 percent with a huge variation between men and women .

UNESCO: celebrates International Literacy Day in Nepal