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7 Simple Questions with No Answers

  • Mundane mysteries

    Bicycle in Plymouth, England in the early 20th century.
    Intro
    CREDIT: Public domain bicycle
    Bicycle in Plymouth, England in the early 20th century.
  • Why do cats purr?

    kittens, pets
    7
    CREDIT: stock.xchng Cats
  • How do bicycles work?

    Bicycle in Plymouth, England in the early 20th century.
    6
    CREDIT: Public domain bicycle
    Bicycle in Plymouth, England in the early 20th century.
  • Why does lightning happen?

    lightning-bolt-100715-02
    5
    CREDIT: NOAA Lightning Bolt
  • Why are moths drawn to lights?

    moth-lamp-02
    4
    CREDIT: sxc.hu Moth Lamp
  • Why are there lefties (and righties)?

    Left-handed baseball pitcher Andy Pettitte photographed in 2009.
    3
    CREDIT: Creative Commons Attribution-Share Alike 2.0 Generic | Keith Allison andy pettitte
    Left-handed baseball pitcher Andy Pettitte photographed in 2009.
  • Why is yawning contagious?

    yawning-woman-1003-02
    2
    Yawning Woman
  • What causes static electricity?

    static-hair
    1
    CREDIT: sxc.hu Static Hair
    Static buildup makes hair stand on end, as positively charged hairs repel each other.

Ask a physicist about the radius of the black hole at the center of the galaxy and she'll tell you more than you wanted to know. Ask her how a bicycle works, and she'll shrug. It may surprise you to learn that scientists lack explanations for some of the simplest questions you might think to ask. Read on for a taste of the many seemingly mundane questions no know can answer.

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