Edwin WiseEdwin is a software engineer with 25 years' experience. He develops software during the day and explores the edges of mad science at night. He can be found at simreal.com.
Author of these Magazine Articles
The Ping Ponger uses almost half of a rubber racquetball as a disc spring that's bistable (it can be at rest in 2 possible states) to propel a ping-pong ball from a compact PVC launcher.
In 123 from MAKE: 24: Space page 44
Flying Crank Ghost
This classic animatronic prop is de rigueur for any serious haunter.
From MAKE: halloween2007: Halloween page 104
Hot Glue Web Gun
Make a spider web shooter that'll surely spread the creeps.
From MAKE: halloween2007: Halloween page 115