Thao Nguyen/FOR AMERICAN-STATESMAN 10/23/10Jim Ollerton, a high school math teacher at San Antonio Academy of Career and Technologies points out the vortex while he watches Bella Bartholomew, 8, (center) and her friend Maya Anderson, 8, play with a vortex machine at the Science and Engineering Fest at the Austin Convention Center in Austin, Texas on Saturday, October 23, 2010.
Thao Nguyen/FOR AMERICAN-STATESMAN 10/23/10Sara Mercado, 11, holds onto a small object that spun when she touched the Van De Graaff and static electricity flowed through her at the Science and Engineering Fest at the Austin Convention Center in Austin, Texas on Saturday, October 23, 2010.
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