| Topic |
2001–2012 |
2013–present |
|
[1#]
[5#]
[7a#]
[4#]
[2#]
[7#]
[9#]
[9#]
[9#]
[5#]
[5#]
[1#]
[1#]
[1#]
[1#]
[1#]
[1#]
[3#]
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[8#]
[7#]
[8#]
[4#]
[8#]
[3#]
[10#]
[6#]
[10#]
[3a#]
[11#]
[3#]
[8#]
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[tree(9)#]
[Aberister(7c)#]
[Scottish chests(4)#]
[exam rate(5a)#]
[air resistance(8c)#]
[spider(3b)#]
[pond(4b)#]
[8#]
[bucket(4)#]
[containers(1b)#]
[3a#]
[4#]
[5a#]
[4#]
[surveyor(7)#]
[4#]
[5d#]
[3#]
[drug(4)#]
[tank(3f)#]
[5bc#]
[light bulb(1)#]
[shawarma kafta(4b)#]
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[catapult(1)#]
[4#]
[solar panel(5)#]
[polar vortex(4c)#]
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[1d#]
[2#]
[Si(1)#]
[5e#]
[7#]
[traffic(10)#]
[2#]
[5#]
[7#]
[particle(8)#]
[1#]
[aphids(8)#]
[horcrux(2)#]
[4#]
[1ab#]
[cookies(3a)#]
[5#]
[7abd#]
[instruction speed(8a)#]
[exam rate(5ab)#]
[7a#]
[air resistance(8a)#]
[2#]
[containers(1)#]
[2a#]
[4#]
[5bd#]
[8a#]
[9#]
[primes(1)#]
[5abe#]
[7#]
[2#]
[BTB(5)#]
[2#]
[3#]
[paint truck(7)#]
[photo sharing(2)#]
[3#]
[8#]
[2#]
[island(3b)#]
[4#]
[5a#]
[2#]
[tank(3)#]
[3cd#]
[5#]
[tortoise+hare(8)#]
[Big House(2)#]
[5#]
[caffeine(7b)#]
[8c#]
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[4#]
[5c#]
[6#]
[1#]
[2#]
[3d#]
[8b#]
[bucket(1)#]
[rollerblading(6)#]
[2#]
[4#]
[boxers1(7bc)#]
[2#]
[3#]
[diver(4)#]
[5#]
[8bc#]
[sparrows(2)#]
[4a#]
[6a#]
[plankton(2)#]
[4c#]
[counting money(5a)#]
[7ab#]
[8c#]
[solar panel(5bc)#]
[8#]
[owl and dove(2)#]
[4#]
[6ac#]
[2#]
[4c#]
[7a#]
[2#]
[3b#]
[polar vortex(4b)#]
[2#]
[toxins1(4)#]
[toxins2(5)#]
[7b#]
[3#]
[heart rate(5)#]
[rocket(7a)#]
[11a#]
[11c#]
[stork(2)#]
[3b#]
[mahogany(8a)#]
[juice(4)#]
[6#]
[9b#]
[2#]
[race(3bc)#]
[2#]
[6a#]
[Poseidon(8)#]
[2#]
[3ac#]
[chipsets(1)#]
[2a#]
[4#]
[5a#]
[sapphire(7a)#]
[2#]
[lasagna(3)#]
[1a#]
[2#]
[Helga(3ac)#]
[rain(4b)#]
[lemonade(1)#]
[lemonade2(2)#]
[4#]
[reservoir(1d)#]
[3#]
[4#]
[8b#]
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|
[Aberister(7)#]
[horcrux(2b)#]
[7c#]
[1b#]
[6#]
[5c#]
[2c#]
[AC current(7)#]
[tortoise+hare(8e)#]
[caffeine(7a)#]
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[4b#]
[3c#]
[bucket(1c)#]
[1c#]
[boxers1(7a)#]
[4a#]
[6d#]
[8a#]
[4a#]
[7b#]
[polar vortex(4a)#]
[toxins1(4d)#]
[1c#]
[3#]
[stork(2c)#]
[8a#]
[1d#]
[6b#]
[1b#]
[rain(4c)#]
[reservoir(1a)#]
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|
[tree(9b)#]
[child height(3)#]
[chemical spill(3a)#]
[particle(8a)#]
[containers(1a)#]
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[rain(4a)#]
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[1#]
[2#]
[3a#]
[8#]
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[1#]
[1#]
[2#]
[8#]
[8b#]
[3#]
[6b#]
[mahogany(8b)#]
[1#]
[1a#]
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[4#]
[2b#]
[1ab#]
[6#]
[5bc#]
[1c#]
[2b#]
[1a#]
[air resistance(8b)#]
[1a#]
[2c#]
[pond(4c)#]
[containers(1d)#]
[3b#]
[8#]
[4b#]
[3b#]
[AC current(7)#]
[8#]
[5b#]
[3df#]
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[1b#]
[5e#]
[1e#]
[3a#]
[3#]
[7#]
[1a#]
[5#]
[1#]
[6a#]
[7#]
[1#]
[1bc#]
[1abd#]
[1#]
[1b#]
[1ac#]
[7a#]
[1b#]
[1d#]
[rocket(7b)#]
[8b#]
[1ac#]
[1acd#]
[1acd#]
[1ad#]
[2cd#]
[1ac#]
[1bd#]
[3#]
[2#]
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[7#]
[2a#]
[1c#]
[5#]
[5a#]
[1b#]
[1d#]
[2a#]
[4#]
[1b#]
[2b#]
[3a#]
[4#]
[primes(1c)#]
[9#]
[4a#]
[3c#]
[AC current(7)#]
[8#]
[5c#]
[3e#]
[8b#]
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[5d#]
[1d#]
[3#]
[7#]
[1b#]
[5#]
[1#]
[1#]
[1c#]
[1#]
[1a#]
[1b#]
[8a#]
[1b#]
[8b#]
[1bc#]
[race(3a)#]
[1bd#]
[1c#]
[8#]
[2b#]
[1b#]
[1d#]
[2c#]
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[1c#]
[containers(1d)#]
[population(2ab)#]
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[3b#]
[1d#]
[1c#]
[8c#]
[7c#]
[7#]
[6#]
[3#]
[8#]
[3a#]
[mushrooms(4)#]
[5#]
[6#]
[7#]
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[3#]
[5#]
[chemical spill(3bcd)#]
[3#]
[3#]
[cookies(3bcd)#]
[6#]
[ice cream(2)#]
[3#]
[drug(4)#]
[photo sharing(2)#]
[garden(6)#]
[island(3a)#]
[tank(3f)#]
[5bc#]
[2#]
[light bulb(1)#]
[Big House(2d)#]
[shawarma kafta(4b)#]
|
[1a#]
[2#]
[board game(7c)#]
[8c#]
[4#]
[1d#]
[5#]
[catapult(1)#]
[4#]
[counting money(5bcd)#]
[7cd#]
[1a#]
[catenary(2d)#]
[8#]
[10ac#]
[4b#]
[tennis balls(9)#]
[5#]
[carrot(7c)#]
[9#]
[park(8)#]
[9bc#]
[11b#]
[7ab#]
[2ab#]
[9a#]
[7#]
[5ab#]
[3d#]
[9b#]
[3bc#]
[cards(5)#]
[9#]
[8#]
[8#]
[10b#]
[reservoir(1bc)#]
[8c#]
[10#]
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|
[table leg(3)#]
[geyser(11)#]
[sandpile(9)#]
[snowman(3)#]
[tank(10)#]
[6#]
[7#]
[6a#]
[Circle City(8)#]
[9e#]
[plate(6)#]
[sculpture(7)#]
[bell(1)#]
[11c#]
[pyramid(3)#]
[pond(4)#]
[earth(4)#]
[submarine(2a)#]
[5#]
[metal sheet(8ab)#]
[sculpture(6)#]
[ice cream(2)#]
[10#]
[4#]
[cubic submarine(6b)#]
[metal plate(8ab)#]
[6#]
[wine glass(7)#]
[4#]
[7#]
[4b#]
[elliptical(7a)#]
[7#]
[9a#]
[light bulb(1)#]
[9#]
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[10#]
[table leg(11)#]
[doorknob(9)#]
[board game(7)#]
[8d#]
[chickens vs. robots(7c)#]
[dog bowl(2a)#]
[money pool(5)#]
[8b#]
[3bc#]
[thumbtack doorknob(10)#]
[jewelry(7)#]
[8d#]
[Hanoi Tower(11)#]
[6b#]
[weather balloon(3)#]
[Rodin Coil(6)#]
[disc tower(2a)#]
[catenary(2b)#]
[rattleback(6)#]
[2#]
[pyramid(7)#]
[10b#]
[juice(10b)#]
[tent(3)#]
[6ab#]
[3c#]
[smoothies(6)#]
[8b#]
[cave(3a)#]
[ring(9)#]
[party horn(8a)#]
[trapezoid(4)#]
[5#]
[containers(3)#]
[4ab#]
[beanstalk(1b)#]
[4a#]
[5c#]
[2#]
[5#]
[submarine(6a)#]
[2b#]
[5b#]
[doughnut(6ab)#]
[6#]
[vuvuzela(8)#]
[cheese(6)#]
[4a#]
[Katydyd(5)#]
[5bd#]
[bakery(5a)#]
[Bundt cake(6)#]
[chocolate(4a)#]
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|
[spider(3a)#]
[spaceship(3)#]
[ramp(5)#]
[garden(6e)#]
[4a#]
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[dog bowl(2b)#]
[3a#]
[8a#]
[6c#]
[4b#]
[catenary(2c)#]
[8d#]
[7c#]
[8a#]
[park(8b)#]
[4c#]
[4b#]
[9a#]
[doughnut(6c)#]
[Helga(3b)#]
[10a#]
[bakery(5b)#]
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|
[stalagmite(9)#]
[pyramid(6)#]
[bucket(4ab)#]
[sculpture(6)#]
[sewage tank(2)#]
[sand dune(8)#]
[bowling pin(5)#]
[garden(6)#]
[plate(10)#]
[tank(6)#]
[lagoon(9)#]
[4c#]
[5a#]
[elliptical(7b)#]
[8#]
[property values(4)#]
[9b#]
[cone(7a)#]
[shawarma kafta(4)#]
[olive oil(9a)#]
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[hemisphere(3)#]
[doorknob(9)#]
[knife(5)#]
[plate(6a)#]
[caffeine IV(1b)#]
[carrots(6)#]
[fishtank(3)#]
[graphene(5)#]
[rattleback(6)#]
[4#]
[Print.juice(3)#]
[juice(10a)#]
[6c#]
[pond(8ab)#]
[paperweight(6)#]
[carrot(7)#]
[8c#]
[Ultron(3a)#]
[cave(3b)#]
[ring(9b)#]
[charge(6)#]
[ice cream(6a)#]
[Chicago Bean(5)#]
[ice cream(9a)#]
[6c#]
[ship(7)#]
[submarine(6bc)#]
[asteroid(8)#]
[UBT(7)#]
[9a#]
[10c#]
[ice cream(9)#]
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