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".
Build a model car that runs on hydrogen gas using a unique reversible fuel cell!
Find the hidden crystals when you open your own geodes from this fun set.
An unconventional ball-tossing, head-catching challenge for 2 players or teams!
Check out this high-quality gyroscope!
Ever wonder how to survive in the wilderness? These cards can help!
This is a classic demonstration toy of the powers of magnetic fields!