Never buy another D battery again with this handy AA to D battery converter! Just place two AA batteries plus side down in the plastic casing, and the unit will operate at the same voltage output (1.5V) as one D battery. Great to have around the home, office, or lab. Measures 2.25" x 1.25" x 1.15".
An ancient toy featuring optical illusion and hands-on fun that never grows old!
Build a robot that's an artist too!
Learn about hydrogen fuel cells with this incredible kit!
This beautiful candle holder is carved out of natural amethyst!
The large realistic model has removable organs that can be studied and set back into the correct position.
This is the ideal reference companion for students of physics, chemistry and biology!