And not all have the same positive effect on the body.
"Six months from now we will see a very positive effect."
It had a positive effect on the economic development of the city.
And the lack of a market, I think, has also had a positive effect.
Only time will tell, but there may be a positive effect.
She made the change to "have a positive effect on young lives."
The researchers hope to see a positive effect on attention and learning.
The oil and gas industry has also had positive effects on the economy.
Already, they say, their move has had a positive effect on the neighborhood.
We hope that this policy too will have a positive effect.