MINNEAPOLIS (WCCO) — Every Friday, Heather Brown answers some of our viewers burning questions. This week, she’ll tell you about the names of highways, how green screens work and about the qualifications for the vice presidency.

Melissa asks: Why do we have so many highways with 94?

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East-West federal highways are usually even numbers and the larger the north, the more northern the route, so I-94 runs from Montana to past Detroit.

As for why 394, 494 and 694 exist, they are shorter routes that branch off their parent, 94. Loop routes, like 694 and 494, generally start with an even number and spur routes, like 394, generally start with odd numbers.

Ten-year-old Andrew from Eden Prairie wants to know: Why are green screens green?

Green screens allow people to key –- or cut out –- a specific color and fill it back in with something else. Not all of these screens are green. In fact, some are actually blue. But, given bright green is a color people don’t traditionally wear on-air, it seems works best for the screen color.

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Tim from St. Paul asks: Can a two-term president become vice president?

According to the Annenberg Public Policy Center, the answer is most likely no, but it’s never been tested in court.

The U.S. Constitution stipulates the vice president has to meet the eligibility requirements of the president, which are being a native-born citizen, 35 years old and living in the U.S. for 14 years. The 12th Amendment states, “no person constitutionally ineligible to the office of President shall be eligible to that of Vice President of the United States.”

The 22nd Amendment also places term limits on the presidency, so a person cannot be elected to that office more than twice. And, because the president is term-limited — you can’t be elected more than twice — it probably makes him ineligible to be VP.

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“But finding out would certainly make for an interesting Supreme Court case,” the Annenberg Center says.

Heather Brown