Some have no real effect, and are known as silent mutations.

ECONOMIST: Genetics gets more complicated

Henry acknowledges the truth of his childhood lesson as he runs frantically along the margin of the knee- high fire in the yellow- brown grass, flapping his arms to no real effect.

NPR: Excerpt: 'Woodsburner'

For soya, some places saw improvements, some saw damage, with no real net effect on the global scale.

ECONOMIST: Climate change and crops

According to a poll by The Economist, 79% of respondents say that they who would support political reforms combating climate change if those changes had no effect on their real income.

FORBES: Climate Change Policies OK, So Long As It's Tax Free, Poll Says

And even if the bailouts work, no one yet knows what their effect will be on the real economy.

NPR: European Rescue Plan Being Ironed Out In Brussels

The real problem is that no affordable sum spent trying to stop smuggling has any effect on supply.

ECONOMIST: Round and round the coca bush