Bob Swaim shows a slinky escalator as he teaches about the slinky as part of Penn State’s OLLI program on Tuesday.
Bob Swaim shows a slinky escalator as he teaches about the slinky as part of Penn State’s OLLI program on Tuesday. Abby Drey adrey@centredaily.com
Bob Swaim shows a slinky escalator as he teaches about the slinky as part of Penn State’s OLLI program on Tuesday. Abby Drey adrey@centredaily.com

Slinky proof that toys needn’t be high-tech to be educational

April 18, 2017 09:55 PM