Spikes of different heights form in an aqueous ferrofluid depending on the distance between the ferrofluid and a magnet. A video of this dramatic sequence can be found as a supplement on JCE Online. Patricia Berger, Nicholas B. Adelman, Katie J. Beckman, Dean J. Campbell, Arthur B. Ellis, and George C. Lisensky discuss the preparation and properties of an aqueous ferrofluid on pages 943-948. The images were taken by Jerry J. Jacobsen with the assistance of Karen Nordell, S. Michael Condren, and George C. Lisensky.
The cover was designed by Betsy True.
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