Sound waves will not travel through a vacuum. Prove it with this demonstration of a ringing bell inside a sealed glass jar. As air is gradually vacuumed out of the jar, the bell will become faint, and will eventually become silent. Great demonstration model for the classroom setting.
Discover a world of kaleidoscopic effects within this perfectly clear prism of the Light Crystal!
Learn how solar cells transform light into electrical energy with this great kit!
Build a tumbling robot that gets up right after it has fallen down, without any outside help!
This glass Erlenmeyer mug makes an excellent gift!
NEW 2016 DESIGN! This hip red tee features Pi to 1000 decimal places on an ultra soft 100% cotton shirt.
Build 20 different solar powered models with unique building pieces, controlled by an RC handset!