The most visible effect was to services provided by social media sites FourSquare, HootSuite, Reddit, and Quora.

FORBES: Will Amazon Outage Stop GovCloud?

Strong partnerships will add to MasterCard's dollar volumes, but may take some time to have a visible effect, Chief Financial Officer Martina Hund-Mejean said in an interview.

WSJ: Global growth boosts MasterCard 4Q net income

The reality is that Dallas-based Southwest Airlines has maintained an 11% capacity growth rate--measured by available seat miles--over the past five years without any visible effect on profitability.

FORBES: The Ghost of Crandall

The reality is that Dallas, Texas-based Southwest Airlines has maintained an 11% capacity growth rate--measured by available seat miles--over the past five years without any visible effect on profitability.

FORBES: The ghost of Crandall

Strikes and industrial incidents have yet to result in any visible effect on exports, which were up 10.2% for the nine months ended March 2013 versus the same period a year earlier, the report said.

WSJ: Moody's: Bangladesh Investor Confidence May Be Hurt

It could also cast light on the mystery of dark matter, a substance that pervades the universe in vastly larger quantities than familiar, visible matter, but whose existence can be inferred only by watching its gravitational effect on visible matter.

ECONOMIST: Particle accelerators

Two further refinements were necessary: to work out the third dimension distance from Earth and to subtract the effect of visible matter in order to be left with the distribution of dark matter pure and simple.

ECONOMIST: Cosmology: I spy with my little gravitational lens | The

However, the effect becomes visible among the very large numbers (eg, the millions) and grows quite pronounced indeed among the very, very large numbers (the billions), the very, very, very large numbers (the quadrillions), and the very, very, very, very large numbers (the quadroons).

ECONOMIST: Poisson: More is more | The

The negative effect on reported levels of happiness of being paid less than your peers is not visible for people aged under 45.

ECONOMIST: How older workers can find happiness

The power of online learning communities is more visible in lean-running start-ups where skills must shift quickly, but I think their effect will be more profound in established companies on a global scale.

FORBES: 5 Ways Social Learning Communities Transform Culture and Leadership