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US Circle Radius Population Split Challenge

Directions

The object of this quiz is to adjust each circle’s diameter so it splits the circle’s population as evenly as possible. When you click Start you will be shown a marker on a random US census tract (there are over 80K census tracts in the US). Also you will see an circle between 200 and 500 miles radius. Adjust the diameter by rotating it using the endpoints, trying to split the halves into equal populations. Then click submit. You are scored on how close you have split the circle into 50% population in each half. Circle population is tallied by totaling all census tracts (small census areas of average 4K population) within that circle.

NOTE – population in Canada and Mexico is NOT counted at all, only US population within the circle.

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US 100 Mile Expanding Circles 2nd Largest City Challenge – Choose City

First choose any US city by entering it and choosing it in the drop-down box. Then, name any US city in each 100 mile circle/ring as the rings expand outward from your city of choice, trying to name SECOND LARGEST city in each circle. The first circle will include your city of choice as a possible answer.

PLEASE NOTE - You must type a '.' (period) after each city to submit it to prevent answering another city with a name you would be have to type to get your answer. If multiple cities have the name you submitted, only the largest one will be counted.

You accumulate points based on the population of the city you named in relation to the second largest city in the circle. A smaller city’s point total will be the ratio of its population to the largest, so if you name a city of 75K people and the largest city has 100K, you get 75 points. Naming the largest city will get you points based on the ratio of the 2nd largest city's population to the largest city's.

When you run out of time or end the quiz, you will see the current ring’s 2nd largest city at right (under ‘Answer Stats’ by your coordinates).

For example, if you choose ‘Chicago’ – you will be shown a circle of radius 100 miles centered at Chicago. Naming any city in this circle (including Chicago) will cause another ‘ring’ of radius 100 miles to appear outside that circle, however - you will want to try naming the SECOND LARGEST city you can to get more points. After completing that circle, you now need to name any US city in the new ring (but not within any previous circles/rings), again trying to name the 2nd largest city. If there are not two cities within the next ring of that distance, the ring will keep expanding by that distance until two cities fall within it.

US Circle Max Population Challenge

Upon clicking START you will be shown 5 circles, one at a time, with increasing radii: 50, 100, 250, 500 and 1000 miles. The object is to move the circle to the location in the US such that it covers the most amount of people, based on US census tract data. You are scored based on how many people you cover compared to the maximum possible (score is based on the ratio of people in your circle compared to max possible - score is not an exact ratio but falls faster than that).

Only population in the US counts, not Canada/Mexico.

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US Random Grid Top 5 Challenge

Type 'easy' or 'hard' to begin the quiz. Easy is a 5-degree grid, hard is a 2.5-degree grid. The grid will be randomly placed on the map. Then, try to name the largest cities in each square IN ORDER. To name a city, you must first click on the grid square to make it have a GREEN border. Then, type in the city answer for that square followed by a '.' (a period).

The squares will start with '0/5' (or maybe fewer cities if less exist in that square). Click on a square and enter the largest city in that square not yet answered (so, the largest city if you have yet to answer a city in that square). You will then have '1/5' and need to click on that square to name the 2nd largest city, and so on until you complete all the cities up to 5 (or less if less exist). If you name an incorrect city in a square it becomes 'locked' and turns red and you can no longer accumulate cities in that square.

You receive 1 point for the largest city in a square, 2 for the 2nd largest, and so on.

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At the end of the quiz the largest remaining city you haven't named will be shown in each square.