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| | Science News: 1990 Ad |
 | | For his research project, Headrick isolated a gene necessary for nitrogen fixation in a type of blue-green algae. |
 | | David Ruchien Liu, a 16-year-old senior at Poly H.S. in Riverside, Calif., placed second in the competition, which is sponsored by the Westinghouse Electric Corp. and administered by Science Service, Inc. Liu, who received a $15,000 scholarship, developed two neural networks on a computer that simulate how human brains process visual information. |
 | | A $15,000 scholarship also went to third-place winner David Michael Shull, a 17-year-old from Henry Foss H.S. in Tacoma, Wash. Shull introduced DNA into fragile human white blood cells by using electric shocks to temporarily open the cell membranes. |
| www.findarticles.com /p/articles/mi_m1200/is_n10_v137/ai_8811493 (320 words) |
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