Few people would question the internet's importance as an educational tool, but a new study suggests the ephemeral nature of web pages can pose significant challenges for educators.

According to research done by two university professors who tracked the existence of web pages used in their online science courses, almost one in five science education web links becomes extinct within two years.

"We were surprised by this steady decline," said John Markwell, a professor of biochemistry at the University of Nebraska in Lincoln. Educators can spend hours searching for appropriate

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