| International Scientific Units | 0 | - | 4.95 | 158,180 |
| Electromagnetic Spectrum | 0 | - | 4.93 | 63,220 |
| Elements of the Periodic Table | 0 | - | 5.00 | 2,258,172 |
| Major Taxonomic Ranks | 0 | - | 4.63 | 81,089 |
| Famous Scientists | 0 | - | 4.57 | 42,835 |
| Elements by Symbol | 0 | - | 4.92 | 198,490 |
| Speed Symbol by Element | 0 | - | 4.90 | 105,471 |
| Chemical Elements with Short Names | 0 | - | 4.81 | 94,717 |
| Noble Gases | 0 | - | 4.89 | 78,773 |
| Elements that are Gases at Room Temperature | 0 | - | 4.86 | 65,004 |
| Periodic Table Symbols | 0 | - | 4.97 | 79,672 |
| Elements with One-Letter Symbols | 0 | - | 4.83 | 82,332 |
| Name the Virus | 0 | - | 4.87 | 77,066 |
| Scientific Names | 0 | - | 4.32 | 78,704 |
| Famous Effects | 0 | - | 4.59 | 12,800 |
| Elements Whose First Letter Doesn't Match the Symbol | 0 | - | 4.87 | 18,667 |
| Body Parts - Sudden Death #1 | 0 | - | 4.86 | 66,720 |
| Bones - Sudden Death | 0 | - | 4.95 | 53,503 |
| First Twenty Elements - Sudden Death | 0 | - | 4.83 | 37,787 |
| Elements - Sudden Death | 0 | - | 4.93 | 135,249 |
| Simple Machines Quiz | 0 | - | 4.35 | 9,154 |
| Things Named For People #3 - Science | 0 | - | 4.85 | 54,252 |
| Elemental Words | 0 | - | 4.97 | 52,531 |
| Metals of Antiquity | 0 | - | 4.95 | 93,851 |
| One Letter Periodic Table Symbols - Sudden Death | 0 | - | 4.88 | 57,030 |
| Science Multiple Choice #1 | 0 | - | 4.53 | 86,925 |
| Animals - Taxonomy to Common Name | 0 | - | 4.81 | 28,456 |
| Lightest Chemical Elements A-Z | 0 | - | 4.57 | 32,084 |
| Periodic Table Quiz - First 20 Elements | 0 | - | 4.73 | 189,677 |
| Periodic Table Elements by Clue #1 | 0 | - | 4.80 | 62,786 |
| Body Part Cliches | 0 | - | 4.44 | 123,644 |
| Bones of the Human Body | 0 | - | 4.51 | 43,473 |
| Medical Conditions Quiz | 0 | - | 4.78 | 124,829 |
| Click the Planet | 0 | - | 4.96 | 92,117 |
| A Quiz About Diamonds | 0 | - | 4.60 | 11,646 |
| Periodic Table Elements by Clue #2 | 0 | - | 4.46 | 12,308 |
| Science Multiple Choice #2 | 0 | - | 4.37 | 36,744 |
| Science Multiple Choice #3 | 0 | - | 4.39 | 34,811 |
| Random Symbol to Element | 0 | - | 4.88 | 93,797 |
| Astronomy Quiz | 0 | - | 4.90 | 83,163 |
| Largest Objects in the Solar System | 0 | - | 4.99 | 138,282 |
| Solar System Trivia | 0 | - | 4.93 | 47,070 |
| Environmental Issues | 0 | - | 4.54 | 26,904 |
| Body Parts - Sudden Death #2 | 0 | - | 4.80 | 45,897 |
| Name a Valid Answer - Science | 0 | - | 4.79 | 41,357 |
| Body Parts in History and Culture | 0 | - | 4.43 | 35,426 |
| Science General Knowledge #1 | 0 | - | 4.54 | 167,223 |
| Science General Knowledge #2 | 0 | - | 4.48 | 119,599 |
| Science General Knowledge #3 | 0 | - | 4.56 | 109,508 |
| Science Vocabulary #2 | 0 | - | 4.52 | 59,926 |
| Word Chain - Science | 0 | - | 4.59 | 55,122 |
| Diseases: Virus... or Bacteria? | 0 | - | 4.61 | 38,928 |
| Most Common Elements in the Human Body | 0 | - | 4.74 | 152,399 |
| Click the Chemical Element | 0 | - | 4.96 | 81,236 |
| Planets of the Solar System Quiz | 0 | - | 4.93 | 1,101,775 |
| Groups of Two - Science | 0 | - | 4.26 | 48,445 |
| Science Vocabulary #1 | 0 | - | 4.34 | 72,146 |
| Science Vocabulary #3 | 0 | - | 4.31 | 52,196 |
| Science Decoder | 0 | - | 4.52 | 28,853 |
| Rocks and Minerals Picture Quiz | 0 | - | 4.48 | 29,500 |
| Science True or False | 0 | - | 4.35 | 40,481 |
| Elements by Picture | 0 | - | 4.27 | 70,279 |
| First Names of Scientists | 0 | - | 4.51 | 57,179 |
| Answers are Elements #2 | 0 | - | 4.43 | 55,184 |
| Periodic Table Elements A-Z | 0 | - | 4.77 | 103,412 |
| Name a Valid Element | 0 | - | 4.67 | 70,376 |
| Name the Constellations - With a Map | 0 | - | 4.92 | 36,146 |
| The Sun Quiz | 0 | - | 4.93 | 35,033 |
| Medical Acronyms | 0 | - | 4.43 | 97,206 |
| Medical Vocabulary | 0 | - | 4.54 | 59,443 |
| Citrus Fruits | 0 | - | 3.66 | 42,145 |
| Most Common Body Part Words | 0 | - | 3.90 | 31,805 |
| The Diseases They Had | 0 | - | 4.15 | 14,064 |
| 16 Questions that Prove that Physics Makes No Sense | 0 | - | 4.18 | 20,937 |
| Birthstones by Month | 0 | - | 4.44 | 87,896 |
| "Ologies" Quiz | 0 | - | 4.34 | 97,492 |
| Albert Einstein Trivia | 0 | - | 4.58 | 18,454 |
| Name the Metal Alloy | 0 | - | 4.73 | 14,004 |
| Answers are Elements #1 | 0 | - | 4.29 | 52,950 |
| Most Guessed Elements on JetPunk | 0 | - | 4.56 | 48,314 |
| Brightest Natural Objects in the Sky | 0 | - | 4.46 | 28,581 |
| Planets By Picture Quiz | 0 | - | 4.49 | 57,302 |
| Body Part Words | 0 | - | 4.43 | 146,337 |
| Animal Anatomy Quiz | 0 | - | 4.39 | 59,943 |
| Word Scramble - Body Parts | 0 | - | 4.38 | 176,980 |
| Three Letter Body Parts | 0 | - | 4.40 | 205,869 |
| Human Body A-Z | 0 | - | 4.51 | 129,594 |
| One-Syllable Human Body Parts | 0 | - | 4.30 | 88,503 |
| Organs of the Human Body (with map) | 0 | - | 4.10 | 119,823 |
| Medical Specialties | 0 | - | 4.33 | 92,265 |
| Diseases and Medical Conditions A-Z | 0 | - | 4.70 | 58,189 |
| Element... or Pokémon? | 0 | - | 4.98 | 132,833 |
| The Pluto Quiz | 0 | - | 4.61 | 9,916 |
| Fish... or Not a Fish? | 0 | - | 4.39 | 43,709 |
| Periodic Table Elements Mentioned in the Bible | 0 | - | 4.77 | 70,940 |
| Category Elimination - Elements | 0 | - | 4.61 | 54,053 |
| Astronomy Decoder | 0 | - | 4.48 | 38,195 |
| The Jupiter Quiz | 0 | - | 4.64 | 16,522 |
| The Mars Quiz | 0 | - | 4.55 | 18,720 |
| The Saturn Quiz | 0 | - | 4.54 | 11,591 |
| Planets - Multiple Choice | 0 | - | 4.39 | 53,801 |
| Body Parts - No Vowels | 0 | - | 4.13 | 25,543 |
| Dumb it Down Doc | 0 | - | 4.13 | 65,160 |
| Signs of the Zodiac Quiz | 0 | - | 4.46 | 227,435 |
| Name the Constellations | 0 | - | 4.58 | 45,596 |
| Astronomy True or False | 0 | - | 4.39 | 36,584 |
| Songs with Body Parts in the Title | 0 | - | 4.32 | 216,348 |
| The Venus Quiz | 0 | - | 4.21 | 6,954 |
| Countries with Glaciers | 0 | - | 4.97 | 105,750 |
| Northernmost Countries Without Glaciers | 0 | - | 4.62 | 36,188 |
| U.S. States with Glaciers | 0 | - | 4.61 | 25,493 |
| Largest Countries Without Glaciers | 0 | - | 4.92 | 35,639 |
| Elements Named for Countries | 0 | - | 4.52 | 24,939 |
| Recommended Childhood Vaccines for Americans | 0 | - | 4.42 | 14,765 |
| Animals by Skeleton Image | 0 | - | 4.81 | 46,879 |
| The Voyage of Darwin - Animated Map Quiz | 0 | - | 4.99 | 14,587 |
| Countries with the Most HIV | 0 | - | 4.46 | 44,526 |
| Countries with the Most Malaria Deaths | 0 | - | 4.45 | 45,523 |
| U.S. States with the Most Drug Overdose Deaths | 0 | - | 4.10 | 26,839 |
| Countries with the Highest Carbon Dioxide Emissions | 0 | - | 4.97 | 109,823 |
| Countries by Carbon Dioxide Emissions per Capita | 0 | - | 4.03 | 49,186 |
| Countries Reducing Carbon Dioxide Emissions the Most | 0 | - | 4.89 | 64,909 |
| Countries with the Most Mangroves | 0 | - | 4.54 | 34,718 |
| Top 10 Solar Power Countries | 0 | - | 4.78 | 60,148 |
| Top 10 U.S. States by Solar Power | 0 | - | 4.25 | 25,905 |
| Worst Plastic Polluting Countries | 0 | - | 4.51 | 66,794 |
| Countries that Desalinate the Most Water | 0 | - | 4.77 | 41,860 |
| Countries with the Most Forest | 0 | - | 4.87 | 147,917 |
| Top 10 Most-Forested U.S. States | 0 | - | 4.37 | 45,754 |
| Least-Forested Countries | 0 | - | 4.53 | 65,393 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,606 |
| Countries with the Most Forest A-Z | 0 | - | 4.63 | 55,680 |
| Most Forested European Countries | 0 | - | 4.80 | 75,636 |
| Least Forested European Countries | 0 | - | 4.25 | 54,167 |
| Least Forested Countries in Asia | 0 | - | 4.75 | 64,902 |
| Countries with the Highest Percentage of Forest | 0 | - | 4.63 | 37,934 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,661 |
| Tropical Rainforest Countries | 0 | - | 4.69 | 82,308 |
| Countries with Tropical Rainforest and Glaciers | 0 | - | 4.51 | 55,767 |
| Countries with the Most Sunlight Per Square Meter | 0 | - | 4.35 | 17,437 |
