1. Today’s 5 most popular stories

    Here are the top stories that MNN readers are clicking on today:

    1. 8 alarmingly unhealthy snacks to avoid
    2. 10 of the world’s biggest unsolved mysteries
    3. What is the smallest thing in the universe?
    4. 7 inventors killed by their inventions
    5. 9 habits that may do more harm than good