As the wave of teacher walkouts moves to Arizona and Colorado this week, an NPR/Ipsos poll shows strong support among Americans for improving teachers' pay and for their right to strike.

It's been nine weeks since teachers in West Virginia walked out of their classrooms to protest low wages and rising health care costs. That sparked a movement that has spread to a handful of other states where teachers have fought — or are fighting — not just for higher wages but also increased spending, more pay for support staff and, in some cases, to stop proposed changes to their pensions.

In fact, so much has happened in the past two months that we thought we'd put together a refresher, state by state.

Updated at 1:54 p.m.

A prescription painkiller that has been under a cloud for more than a decade is apparently safer than previously believed, a Food and Drug Administration panel concluded Wednesday.

During intense arguments at the Supreme Court on Wednesday, the justices, by a narrow margin, seemed to be leaning toward upholding the third and current version of the Trump travel ban.

Justice Anthony Kennedy, who is often the deciding vote in closely contested cases, for example, made repeated comments suggesting that the court does not usually second-guess a president's national security decisions — even in the context of an immigration law that bans discrimination based on nationality.

The head of the Environmental Protection Agency, Scott Pruitt, has proposed a new rule that restricts scientific research that can be used by the agency for its regulatory decisions.

The proposed rule only allows the use of studies that make all data publicly available for anyone to analyze. Pruitt proposed the new rule as a way to make the agency's decision-making more "transparent, objective and measurable."

Updated at 4:19 p.m. ET

Interest rates reached a milestone Tuesday and the stock market frowned.

Tuesday morning, for the first time in four years, the rate on the 10-year U.S. government note topped 3 percent. The bond market move contributed to a sharp sell-off in stocks, as investors wondered whether the long-running bull market might be at a pivot point.