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"World Polio Day is a day that has been set aside to celebrate all of the workers that are involved in this," says Wenger. There are hundreds of thousands of ground-level health workers all over the world trying to help kids have a better life.

Those are the people you don't hear a lot about, because they are at the bottom end of the vaccination distribution chain.

"In the last couple of years, we've seen unprecedented progress.

In 2015 we could only find 74 cases; in 2016 we found 37, and then this year so far we've found only 12 in only two countries." The reason: a mass immunization effort to orally vaccinate 2.5 billion children in 122 countries, bolstered by the 1988 launch of the Global Polio Eradication Initiative. Jonas Salk is credited with developing the first safe and effective polio vaccine in 1955, there were still about 350,000 cases of polio worldwide 30 years later.

Not until it's certain that polio has been completely wiped out will the commitment end, says Dr. "You might be wondering why we're spending so much money when there's only 12 cases," he says.

But publicly ranking teachers by name will not help them get better at their jobs or improve student learning.

On the contrary, it will make it a lot harder to implement teacher evaluation systems that work.

Coincidentally, Jonas Salk and Bill Gates have something more in common: Both share the same birth date — October 28.

I am a strong proponent of measuring teachers' effectiveness, and my foundation works with many schools to help make sure that such evaluations improve the overall quality of teaching.

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According to the World Health Organization, as long as a single child remains infected, children in all countries are at risk of contracting polio.

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