This is the real thing! Heavy duty Rock Tumbler does much more than ordinary rock polishers - it actually changes rough stones into beautiful, high-luster, semi-precious gemstones. You can even make jewelry and key chains with the settings included in this set. U.L. Listed.

Set includes: Tumbling machine with heavy-duty motor, rough semi-precious stones (including amethyst, jasper, agate, and others), grit, polish, jewelry settings, glue, and instruction manual.

These projects kits are excellent for those budding electronic engineers from age 6 and up

To teach principles of Electronics and Electricity. Experiments and kit building with ease, practically no tools needed. Each part is designed for easy and quick assembly. Components connected together with press-studs. The easy to handle components snap together to create a huge number of different circuits on the base board. Many hours of fun while learning. The process of actually building the circuits provides a real understanding of how circuits work. All wires are secured within the components so the kit is entirely safe and amazingly simple to operate. Kids of all ages will rapidly learn how to set up the circuits and will be entranced by the results of their experiments. Older kids will increase their knowledge of electronics by using their imaginations to design their own circuits. Understanding of Electronics is a vital part of a child's scientific education. These kits remove the frustration of handling small and delicate electronic parts, replacing them with safe and reliable components. They work on AA Batteries, not provided. Complete with instruction booklet.

Invented by William Crooke in the 1860s, this device demonstrates the conversion of light energy into mechanical energy. The vanes in the evacuated glass bulb are Black and White in color. The dark vanes absorb the rays and the light vanes reflect the rays. This is a great way to study how light energy is converted into mechanical energy. The stronger the light, the faster it spins. It measures approximately 5" by 3".