Another reason is that a small change in temperature can mean the difference between snow and rain.

VOA: special.2010.01.05

She says small changes multiplied by millions can make a huge difference.

VOA: special.2009.11.06

But in a small,short person, Skinner says,just 3 kilograms can make the difference between a healthy weight and obesity.

VOA: standard.2010.03.09

And in sub-Saharan Africa, where only four percent of the land is irrigated, buying a small pump can make a big difference.

VOA: standard.2010.08.09