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<br /> IN ThIs Issue:<br /> Seeking WIMPY Particles • Exploring Saturn’s Rings<br /> • Picking Five-Star Movies<br /> California Institute of Technology<br /> Volume lXXIII, Number 2, sprINg 2010<br /> on the cover<br /> Saturn’s rings are made of particles ranging from tiny pieces of dust to huge boul-<br /> ders. on May 3, 2005, the cassini spacecraft sent radio signals back to earth through<br /> the rings to measure the particles’ size distribution. In this simulated image, which<br /> has a resolution of 10 kilometers, purple represents regions where all the particles<br /> are bigger than five centimeters wide. Green areas contain particles smaller than five<br /> centimeters, and blue ones have particles smaller than one centimeter. the white<br /> zones are so dense that the signal didn’t get through<a title="Engineering &amp; Science Spring 2010 page 1" href="http://viewer.zmags.com/publication/6e52b3ac?page=1"> IN ThIs Issue: Seeking WIMPY Particles • Explorin</a> <a title="Engineering &amp; Science Spring 2010 page 2" href="http://viewer.zmags.com/publication/6e52b3ac?page=2"> </a> <a title="Engineering &amp; Science Spring 2010 page 3" href="http://viewer.zmags.com/publication/6e52b3ac?page=3"> Reproduced by permission of Netflix, Inc., Copyri</a> <a title="Engineering &amp; Science Spring 2010 page 4" href="http://viewer.zmags.com/publication/6e52b3ac?page=4"> random Walk Schlinger lab DeDicateD </a> <a title="Engineering &amp; Science Spring 2010 page 5" href="http://viewer.zmags.com/publication/6e52b3ac?page=5"> ings designed for chemical research. Meeting the </a> <a title="Engineering &amp; Science Spring 2010 page 6" href="http://viewer.zmags.com/publication/6e52b3ac?page=6"> collects the runoff from the adjoining planters, </a> <a title="Engineering &amp; Science Spring 2010 page 7" href="http://viewer.zmags.com/publication/6e52b3ac?page=7"> On March 9, Mylar dirigibles battled for the s</a> <a title="Engineering &amp; Science Spring 2010 page 8" href="http://viewer.zmags.com/publication/6e52b3ac?page=8"> sor of Electrical Engineering. These flies proved </a> <a title="Engineering &amp; Science Spring 2010 page 9" href="http://viewer.zmags.com/publication/6e52b3ac?page=9"> The six figures on </a> <a title="Engineering &amp; Science Spring 2010 page 10" href="http://viewer.zmags.com/publication/6e52b3ac?page=10"> Throop Hall was demo</a> <a title="Engineering &amp; Science Spring 2010 page 11" href="http://viewer.zmags.com/publication/6e52b3ac?page=11"> either peptide alone. Repeating the process to ad</a> <a title="Engineering &amp; Science Spring 2010 page 12" href="http://viewer.zmags.com/publication/6e52b3ac?page=12"> 2007, respectively, Voyagers 1 and 2 crossed into</a> <a title="Engineering &amp; Science Spring 2010 page 13" href="http://viewer.zmags.com/publication/6e52b3ac?page=13"> the National Institutes of Health, the Simons Fou</a> <a title="Engineering &amp; Science Spring 2010 page 14" href="http://viewer.zmags.com/publication/6e52b3ac?page=14"> getting inSiDe a fly’S heaD What goes on in the</a> <a title="Engineering &amp; Science Spring 2010 page 15" href="http://viewer.zmags.com/publication/6e52b3ac?page=15"> OlD MagazineS neVer Die . . . The Intel Science</a> <a title="Engineering &amp; Science Spring 2010 page 16" href="http://viewer.zmags.com/publication/6e52b3ac?page=16"> A Mine for Dark Matter Res</a> <a title="Engineering &amp; Science Spring 2010 page 17" href="http://viewer.zmags.com/publication/6e52b3ac?page=17"> Each CDMS detector is a 230- gram ge</a> <a title="Engineering &amp; Science Spring 2010 page 18" href="http://viewer.zmags.com/publication/6e52b3ac?page=18"> In addition to CDMS, Golwala’s research group wor</a> <a title="Engineering &amp; Science Spring 2010 page 19" href="http://viewer.zmags.com/publication/6e52b3ac?page=19"> A composite image of the Bullet Cluster, which i</a> <a title="Engineering &amp; Science Spring 2010 page 20" href="http://viewer.zmags.com/publication/6e52b3ac?page=20"> ore. It closed in 1962, and is now a state park a</a> <a title="Engineering &amp; Science Spring 2010 page 21" href="http://viewer.zmags.com/publication/6e52b3ac?page=21"> Far left: The Soudan mineshaft in winter. Middle:</a> <a title="Engineering &amp; Science Spring 2010 page 22" href="http://viewer.zmags.com/publication/6e52b3ac?page=22"> The barn was born during the Manhattan Pr</a> <a title="Engineering &amp; Science Spring 2010 page 23" href="http://viewer.zmags.com/publication/6e52b3ac?page=23"> WIMPs have cross sections bigger than this limit,</a> <a title="Engineering &amp; Science Spring 2010 page 24" href="http://viewer.zmags.com/publication/6e52b3ac?page=24"> Cassini’s Ringside Seat Saturn’s rings and moons </a> <a title="Engineering &amp; Science Spring 2010 page 25" href="http://viewer.zmags.com/publication/6e52b3ac?page=25"> Opposite: Linda Spilker, Cassini’s project sci- e</a> <a title="Engineering &amp; Science Spring 2010 page 26" href="http://viewer.zmags.com/publication/6e52b3ac?page=26"> The gravitational pull of a tiny moon named Daphn</a> <a title="Engineering &amp; Science Spring 2010 page 27" href="http://viewer.zmags.com/publication/6e52b3ac?page=27"> Watch Porco discuss Cassini’s and Huygen’s explor</a> <a title="Engineering &amp; Science Spring 2010 page 28" href="http://viewer.zmags.com/publication/6e52b3ac?page=28"> with it. Orbital resonance then keeps these parti</a> <a title="Engineering &amp; Science Spring 2010 page 29" href="http://viewer.zmags.com/publication/6e52b3ac?page=29"> the B ring, because it is so optically thick.” </a> <a title="Engineering &amp; Science Spring 2010 page 30" href="http://viewer.zmags.com/publication/6e52b3ac?page=30"> Below: A natural-color shot of icy Dione, snapped</a> <a title="Engineering &amp; Science Spring 2010 page 31" href="http://viewer.zmags.com/publication/6e52b3ac?page=31"> The propellers in context. The leftmost photo sho</a> <a title="Engineering &amp; Science Spring 2010 page 32" href="http://viewer.zmags.com/publication/6e52b3ac?page=32"> the way in which Enceladus is generating heat—and</a> <a title="Engineering &amp; Science Spring 2010 page 33" href="http://viewer.zmags.com/publication/6e52b3ac?page=33"> “The geysers of Enceladus,” says Porco, “are perh</a> <a title="Engineering &amp; Science Spring 2010 page 34" href="http://viewer.zmags.com/publication/6e52b3ac?page=34"> Recommend a Movie, Win a Million Bucks Reproduced</a> <a title="Engineering &amp; Science Spring 2010 page 35" href="http://viewer.zmags.com/publication/6e52b3ac?page=35"> Contrary to popular belief, self- </a> <a title="Engineering &amp; Science Spring 2010 page 36" href="http://viewer.zmags.com/publication/6e52b3ac?page=36"> tHe netflix prize as a teacHing tool The most imp</a> <a title="Engineering &amp; Science Spring 2010 page 37" href="http://viewer.zmags.com/publication/6e52b3ac?page=37"> Reproduced by permission of Netflix, Inc., Copyri</a> <a title="Engineering &amp; Science Spring 2010 page 38" href="http://viewer.zmags.com/publication/6e52b3ac?page=38"> each factor’s numerical value indicating how much</a> <a title="Engineering &amp; Science Spring 2010 page 39" href="http://viewer.zmags.com/publication/6e52b3ac?page=39"> of these side variables, I got a significant boost</a> <a title="Engineering &amp; Science Spring 2010 page 40" href="http://viewer.zmags.com/publication/6e52b3ac?page=40"> We decloaked on Saturday afternoon. With less tha</a> <a title="Engineering &amp; Science Spring 2010 page 41" href="http://viewer.zmags.com/publication/6e52b3ac?page=41"> press conference in New York on Septem- ber 21. I</a> <a title="Engineering &amp; Science Spring 2010 page 42" href="http://viewer.zmags.com/publication/6e52b3ac?page=42"> A TRUE ALTERNATIVE FOR YOUR FAMILY We're </a> <a title="Engineering &amp; Science Spring 2010 page 43" href="http://viewer.zmags.com/publication/6e52b3ac?page=43"> Engineering & Science welcomes letters. Send corr</a> <a title="Engineering &amp; Science Spring 2010 page 44" href="http://viewer.zmags.com/publication/6e52b3ac?page=44"> The article in the Winter 2010 issue of E&S e</a> <a title="Engineering &amp; Science Spring 2010 page 45" href="http://viewer.zmags.com/publication/6e52b3ac?page=45"> A Dream of Undying Fame: How Freud Betrayed His M</a> <a title="Engineering &amp; Science Spring 2010 page 46" href="http://viewer.zmags.com/publication/6e52b3ac?page=46"> we cannot know why) and then, as if by magic, he </a> <a title="Engineering &amp; Science Spring 2010 page 47" href="http://viewer.zmags.com/publication/6e52b3ac?page=47"> IF A MATHEMATICAL EQUATION COULD E X P R E S S GR</a> <a title="Engineering &amp; Science Spring 2010 page 48" href="http://viewer.zmags.com/publication/6e52b3ac?page=48"> California Institute of Technology Pasadena, Cali</a>