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Hints & answers · 2026-11-12

Hints & answers: 2026-11-12

Published at 00:00 UTC · Edition version 1

Hints first. Answers when you’re ready. Each explanation includes a source so you can follow your curiosity.

Launch edition. Original prompts and finite answer sets checked against cited references; AI-assisted editorial review.

Chemistry

1. Name a noble-gas element with atomic number below 100.

Look in the far-right group of the periodic table.

Reveal accepted answers
  • Helium · 40 points

    Helium has symbol He and atomic number 2. Its reference classification is noble gas.

  • Neon · 70 points

    Neon has symbol Ne and atomic number 10. Its reference classification is noble gas.

  • Argon · 70 points

    Argon has symbol Ar and atomic number 18. Its reference classification is noble gas.

  • Krypton · 100 points

    Krypton has symbol Kr and atomic number 36. Its reference classification is noble gas.

  • Xenon · 100 points

    Xenon has symbol Xe and atomic number 54. Its reference classification is noble gas.

  • Radon · 100 points

    Radon has symbol Rn and atomic number 86. Its reference classification is noble gas.

Sources: PubChem Periodic Table ↗

World geography

2. Name a country or area in the UN M49 Northern Africa statistical grouping.

Use the UN statistical grouping; it includes territories as well as sovereign countries.

Reveal accepted answers
  • Algeria · 100 points

    Algeria is included in the Northern Africa grouping in UN M49. This is a statistical classification, not a statement about political status.

  • Egypt · 100 points

    Egypt is included in the Northern Africa grouping in UN M49. This is a statistical classification, not a statement about political status.

  • Libya · 100 points

    Libya is included in the Northern Africa grouping in UN M49. This is a statistical classification, not a statement about political status.

  • Morocco · 100 points

    Morocco is included in the Northern Africa grouping in UN M49. This is a statistical classification, not a statement about political status.

  • Sudan · 100 points

    Sudan is included in the Northern Africa grouping in UN M49. This is a statistical classification, not a statement about political status.

  • Tunisia · 100 points

    Tunisia is included in the Northern Africa grouping in UN M49. This is a statistical classification, not a statement about political status.

  • Western Sahara · 100 points

    Western Sahara is included in the Northern Africa grouping in UN M49. This is a statistical classification, not a statement about political status.

Sources: UN Statistics Division M49 ↗

Star patterns

3. Name a constellation represented by a bird, including the mythical phoenix.

Think beyond the swan and eagle.

Reveal accepted answers
  • Apus · 100 points

    The reference connects Apus with bird of paradise. The Latin name is the accepted constellation answer.

  • Aquila · 100 points

    The reference connects Aquila with eagle. The Latin name is the accepted constellation answer.

  • Columba · 100 points

    The reference connects Columba with dove. The Latin name is the accepted constellation answer.

  • Corvus · 100 points

    The reference connects Corvus with crow. The Latin name is the accepted constellation answer.

  • Cygnus · 70 points

    The reference connects Cygnus with swan. The Latin name is the accepted constellation answer.

  • Grus · 100 points

    The reference connects Grus with crane. The Latin name is the accepted constellation answer.

  • Pavo · 100 points

    The reference connects Pavo with peacock. The Latin name is the accepted constellation answer.

  • Phoenix · 100 points

    The reference connects Phoenix with phoenix. The Latin name is the accepted constellation answer.

  • Tucana · 100 points

    The reference connects Tucana with toucan. The Latin name is the accepted constellation answer.

Sources: NASA StarChild constellation reference ↗

United States

4. Name a U.S. state in the Census Bureau’s New England division.

Use the Census division, not an informal cultural region. Washington, D.C. is not a state.

Reveal accepted answers
  • Connecticut · 100 points

    Connecticut belongs to the New England division on the Census Bureau regional map.

  • Maine · 100 points

    Maine belongs to the New England division on the Census Bureau regional map.

  • Massachusetts · 100 points

    Massachusetts belongs to the New England division on the Census Bureau regional map.

  • New Hampshire · 100 points

    New Hampshire belongs to the New England division on the Census Bureau regional map.

  • Rhode Island · 100 points

    Rhode Island belongs to the New England division on the Census Bureau regional map.

  • Vermont · 100 points

    Vermont belongs to the New England division on the Census Bureau regional map.

Sources: U.S. Census regions and divisions ↗

Number puzzles

5. Give a prime number between 10 and 30, inclusive. Enter digits.

A prime has exactly two positive divisors.

Reveal accepted answers
  • 11 · 40 points

    11 satisfies the stated numerical condition. The finite answer set was checked by direct integer arithmetic. Its only positive divisors are 1 and itself.

  • 13 · 40 points

    13 satisfies the stated numerical condition. The finite answer set was checked by direct integer arithmetic. Its only positive divisors are 1 and itself.

  • 17 · 40 points

    17 satisfies the stated numerical condition. The finite answer set was checked by direct integer arithmetic. Its only positive divisors are 1 and itself.

  • 19 · 40 points

    19 satisfies the stated numerical condition. The finite answer set was checked by direct integer arithmetic. Its only positive divisors are 1 and itself.

  • 23 · 70 points

    23 satisfies the stated numerical condition. The finite answer set was checked by direct integer arithmetic. Its only positive divisors are 1 and itself.

  • 29 · 70 points

    29 satisfies the stated numerical condition. The finite answer set was checked by direct integer arithmetic. Its only positive divisors are 1 and itself.

Sources: Prime number definition, Wolfram MathWorld ↗

Measurement

6. Name an SI prefix representing a factor of at least one million.

Think above kilo.

Reveal accepted answers
  • quetta · 100 points

    quetta represents a factor of 10^30 in SI notation.

  • ronna · 100 points

    ronna represents a factor of 10^27 in SI notation.

  • yotta · 100 points

    yotta represents a factor of 10^24 in SI notation.

  • zetta · 100 points

    zetta represents a factor of 10^21 in SI notation.

  • exa · 100 points

    exa represents a factor of 10^18 in SI notation.

  • peta · 100 points

    peta represents a factor of 10^15 in SI notation.

  • tera · 100 points

    tera represents a factor of 10^12 in SI notation.

  • giga · 70 points

    giga represents a factor of 10^9 in SI notation.

  • mega · 70 points

    mega represents a factor of 10^6 in SI notation.

Sources: NIST SI prefixes ↗

Solar system

7. Name one of the four terrestrial planets in our solar system.

These are the rocky inner planets.

Reveal accepted answers
  • Mercury · 40 points

    Mercury is included in the NASA reference set for this prompt. It is one of the four rocky inner planets.

  • Venus · 40 points

    Venus is included in the NASA reference set for this prompt. It is one of the four rocky inner planets.

  • Earth · 40 points

    Earth is included in the NASA reference set for this prompt. It is one of the four rocky inner planets.

  • Mars · 40 points

    Mars is included in the NASA reference set for this prompt. It is one of the four rocky inner planets.

Sources: NASA planet reference ↗