2007 Intel Science Talent Search Winners

First Place: $100,000 scholarship, Mary Masterman, 17, Oklahoma City, for developing an accurate spectrograph that identifies the specific characteristics-or "fingerprints"-of different kinds of molecules.

Second Place: $75,000 scholarship, John Pardon, 17, Chapel Hill, N.C., for a project that showed a finite-length closed curve in the plane can be made convex in a continuous manner, and without bringing any two points of the curve closer together.

Third Place: $50,000 scholarship, Dmitry Vaintrob, 18, Eugene, Oregon, for a project that proved loop homology and Hochschild cohomology coincide for an important class of spaces.

Fourth Place: $25,000 scholarship, Catherine Schlingheyde, 17, Oyster Bay, N.Y., for her research on microRNA repression, a basic mechanism that regulates cell function.

Fifth Place: $25,000 scholarship, Rebecca Kaufman, 17, Croton-on-Hudson, N.Y., for her study of the effects of male hormones in a model of schizophrenia.

Sixth Place: $25,000 scholarship, Gregory Brockman, 18, of Thompson, N.D., for his mathematics project that provided a thorough analysis of Ducci sequences, also known as the "four-number game."

Seventh Place: $20,000 scholarship, Megan Blewett, 17, of Madison, N.J., for her analysis of a protein that may be implicated in multiple sclerosis and amyotrophic lateral sclerosis.

Eighth Place: $20,000 scholarship, Daniel Handlin, 18, of Lincroft, N.J., for developing an accurate, low-cost method of determining the position of geo-stationary Earth-orbit (GEO) satellites.

Ninth Place: $20,000 scholarship, Meredith MacGregor, 18, of Boulder, Colorado, for her research on the fluid dynamics of the "Brazil Nut Effect," in which shaken particles separate by size with the largest on top.

Tenth Place: $20,000 scholarship, Emma Call, 18, Baltimore, Maryland, for the fabrication of 3-D microcubes, which have potential use as novel drug-delivery devices.