El Niño is here! And ready to make summer and the dregs of spring even hotter and drier. That's not great for Canada, which spent this week exporting a commodity no one wants: wildfire smoke, now polluting a swath of the United States.

Asked when the air would clear, experts told NPR "when the weather changes or the fires stop." A Magic 8 Ball, just as usefully, told NPR, "Reply hazy, try again."

In contrast, all of these quiz questions have actual answers. So ... how well have you been paying attention?

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Correction

An earlier version of this quiz said the Supreme Court upheld a 1986 provision of the Voting Rights Act. In fact, the act was amended in 1982 and the Supreme Court made a precedent-setting ruling in 1986.