This Month’s Cover..."Poolside Phenomenon," from the 2009 AAPT High School Physics Photo Contest won 2nd place in the Contrived Category. The photographer is Samantha Gold from Plainview-Old Bethpage JFK High School in Plainview, NY. Her teacher is Jordan Pekor. Read about the physics of the photo at our website, www.aapt.org

This Month’s Cover...Zhu and Shi’s paper beginning on p. 424 of this issue discusses why a small fish in a spherical fishbowl "disappears" when viewed from a specific location.

This Month’s Cover...shows a gymnast performing on the uneven parallel bars. The paper "The Physics of a Gymnastics Flight Element," by Jonas Contakos and coauthors, begins on p. 355 of this month’s issue. (Photo by Sing Lo)

This Month’s Cover...This cover photo shows a portion of the 9600 photomultiplier tube sensors and reflectors for the Sudbury Neutrino Observatory detector, with the bottom of the 12-meter diameter acrylic vessel visible at the top. The green photomultiplier tubes have received a single photon of light from a typical neutrino scattering event in the heavy water inside the acrylic vessel, and the ring pattern is analyzed to reveal neutrino information. See the paper by Hallin and Hallman beginning on p. 274 of this month’s issue. (Photo: Lawrence Berkeley National Laboratory, Roy Kaltschmidt, photographer))

This Month’s Cover...Nanotubes 70-100 nm in diameter containing cobalt-palladium alloy at the ends. In the magnetic field maps the colors represent the direction and intensity of the field, and the contours the magnetic field lines. Mark Freeman’s paper "Nanomagnetism: A Case History of Nanoscience and Technology" begins on p. 206 of this month’s issue. (Photo acknowledgments: Ed Simpson, Yasuhiko Hayashi, Takeshi Kasama and Rafal Dunin-Borkowski, University of Cambridge. © Ed Simpson)

This month’s cover...This Month’s Cover...features a colorful 2008 AAPT High School Photo Contest entry. This scene was created by pouring Sour Skittles® candy into a sink filled with an inch of cold tap water. The candies were allowed to sit in the water for 15 minutes. The principle of entropy, which states that all objects have a tendency to become more disordered, is shown in this picture. When placed into the water, colored dyes from the candy surfaces diffused away in increasingly random patterns, sometimes mixing together to form a new color. Photo by: Christopher M. Wemp Aptos High School, Aptos, CA Teacher: Joe Manildi

This month’s cover...Mark Ilyes and Whitney Ortman-Link describe a physics "road rally" activity in their paper beginning on p. 98 of this month’s issue.

This Month’s Cover...A Fermilab image in which the reflecting pond in front of Wilson Hall has been replaced by the image of a particle collision event that produced a top quark. The picture of the sky is from the Sloan Digital Sky Survey. Teresa MacDonald and Alice Bean’s paper “Quarked!- Adventures in Particle Physics Education” begins on p. 38 of this issue.