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  1. Math

    Trimathlon Palindromes

    “A man, a plan, a canal–Panama.” This statement is a famous example of a palindrome–a phrase that reads the same forward or backward. Inventive wordsmiths and puzzlists have come up with all sorts of words, sentences, and even paragraphs that have this property. The term palindrome can also be applied to whole numbers, such as […]

    By Ivars Peterson
  2. Earth

    River Stats Trickle In: Major floods may be waning in Europe

    A new analysis of historical flood records from central Europe suggests that widespread inundations in the region have been on the wane for the past century or so.

    By Sid Perkins
  3. Health & Medicine

    Paper Chased: Cancer-vaccine study is retracted

    Researchers in Germany have retracted a paper that reported promising results for a vaccine that elicited immune responses against cancer cells.