
AKA hand boiler. An exotic bit of hand blown glass with a bulb at top and bottom connected by some zippy tubing that spirals, loops, and/or jogs. In the closed system is some colored liquid (methyl chloride) that is very light. Hold the lower bulb in you hand and as the air in the system is warmed it pushes the fluid through the loops to the upper chamber. When all the liquid is pushed out of the lower bulb, expanding air will bubble through the tubing making it appear that the liquid is boiling. WARNING! The glass is fragile and the liquid is nasty. If you drop the thing on e.g. the kitchen tile, it will eat the finish off the tile and the stain in the liquid will permanently stain the floor. So don't let kids handle this item unsupervised. About 7" tall, it is a favorite in our stores.
![]() |
6199 LOVE METER |
An easy way to light up the kids' eyes! Teach them to wire a simple circuit with our basic components. The knife switch is mounted on a plastic base. The miniature plastic socket holds a standard flashlight bulb with a 14 mm dia screw base. We pack 6 volt and 3 volt round bulbs, or 1.5 volt bell-shaped bulbs, (5) to a package.(Bulbs are rated slightly higher to prevent them from burning out.) Or hook up the black plastic and metal 2" x 4-1/4" telegraph key with brass contacts and (2) terminal posts with nuts. Our blue-plastic holder for (1) "D" battery has a small tab at each end to hook a lead to, and a 1/8" square mounting hole at each corner. You add the mounting surface and the know-how. Actual bulb voltage listed in parenthesis.
![]() |
91160 1.5 VOLT BULBS (2.5 V) | |
![]() |
91159 3 VOLT BULBS (3.8V) | |
![]() |
91158 6 VOLT BULBS (6.3V) | |
![]() |
38806 KNIFE SWITCH, DOUBLE POLE DOUBLE THROW | |
![]() |
38808 KNIFE SWITCH, DOUBLE POLE SINGLE THROW | |
![]() |
38805 KNIFE SWITCH, SINGLE POLE SINGLE THROW | |
![]() |
91769P1 SINGLE "D" BATTERY HOLDER | |
![]() |
38811P1 SOCKET | |
![]() |
91813 TELEGRAPH KEY |
See psychedelic patterns the safe way! Press your hand on this 6" x 6" sheet of liquid crystal and leave a print of swirling colors that, like the mood ring of yore, you can use as a sign of your mood. The pattern will blend and fade in seconds as the crystals react to temperature. Tiny liquid crystals inside the film-like material react to heat by changing colors. As science, it demonstrates the way liquid crystal displays work. And you can cut it into pieces to incorporate into a science project. Or just leave it out for guests to play with when the party turns boring.
![]() |
91582 LIQUID CRYSTAL SHEET |
A collection of 11" x 14" top quality medical charts. They cover topics such as organs: "Eye" or "Skin", systems: "Digestive" or "Female Reproductive" and disease or conditions such as: "Cancer" and "Obesity". They are on heavy coated paper suitable for putting up in, say, a classroom where they would be excellent teaching aids. Most are overruns that are imprinted with the name of a drug at the bottom and were distributed as part of a promotion. A few have misspelling misprints. Because of varying quantities and a horrendous sorting problem, we cannot give you the luxury of picking your favorites from a long list. We also have (2) large (20" x 26") wall charts, One on hypertension and one on the male reproductive system.
![]() |
20664 ANAT CHARTS, PKG(12) | |
![]() |
20655 ANAT CHARTS, PKG(2) | |
![]() |
23059 HYPERTEN WALL CHART | |
![]() |
23062 MALE REPRO WALL CHART |
You can start with our single aluminum tuning fork, 2-tined and 7-1/2" long. It vibrates at 256 hz, and is labeled "C". Or you can order the set that has (8) forks and a mallet with a rubber-tipped plastic head. The forks are labeled low-C to high-C and come in a fitted, latched wooden box. Unfortunately, C.J., who has perfect pitch, tells us that his pitch is more perfect than most of the tuning forks. He also says you can file the tips, tuning them to an electronic keyboard until they're perfect - and we think there's a certain cachet to telling people you tuned the forks yourself. But they are perfect, if you're using them for things like teaching principles of sound or driving the chihuahua crazy.
![]() |
91185 TUNING FORK | |
![]() |
91772 TUNING FORKS, SET |
Eye dropper, tongue dropper, test tube dropper, petri dish dropper, anywhere dropper. Use this 3" glass dropper, with a rubber squeeze bulb to drop small amounts of liquid wherever you think they should go. You will have to measure by counting drops, though, because there are no markings on it. Also, it is called "3" because that is about how long the glass tube is. Overall, it is 4" long.
![]() |
89039 DROPPER, 3" |
WARNING: CHOKING HAZARD-Small Parts. Not for children under 3 yrs.
Everything you need to build a little DC motor is included in this kit (except sandpaper, screwdriver, scissors and, of course, an AA battery). The instructions are simple and explain the theory as well as assembly. Fun and educational.
![]() |
91508 TOY MOTOR KIT |
WARNING: CHOKING HAZARD-Small Parts. Not for children under 3 yrs.
A pair of kits for ages 10 and up which will be fun to assemble and great educational aids for learning anatomy. Each is a complete, 15" tall model of the human body, including skeleton, internal organs and a clear plastic skin through which they may be viewed. Of course, what you get is all the bits and pieces. So the assembler must identify the parts, paint them (optional, paint not included) and glue them together to complete the finished man or woman. Which is what provides the fun and learning. Simple well illustrated directions and a comprehensive booklet summarizing the functions of the parts and explaining the body's systems (respiratory, digestive, endocrine, etc.) are included. A long standing favorite in our stores.
![]() |
70228 VISIBLE MAN | |
![]() |
70283 VISIBLE WOMAN |
This idea is for the birds. Literally. A green/black plastic perch, dish, and dispenser that you can screw onto an inverted plastic pop bottle to convert it into a bird feeder. Obviously, the bottle should have been emptied of pop and filled with seed. One of those "100 things to do with old coat hangers" ideas that really works!! Complete with instructions and bail to hang the completed feeder. Please note: this feeder will not attach properly to the new Coca-Cola low-profile bottles.
![]() |
89308 WILD BIRD FEEDER |
This (10) piece set of weights are brass cylinders topped with knobs. The weights are stamped on the top. There are (2) each of 1, 2, 5 and 10 grams, plus (1) 20 and (1) 50 gram weight. If you don't want to display them, they can be stored in their molded plastic holder. Our each is the full set.
![]() |
90070 BRASS WEIGHTS |
Incredible stuff!! And even better than those dinky cutouts you used to make! Our each is a pack of (8) 8" x 10-1/2" shrinking plastic sheets that start clear and stay clear. Draw a design, write a message, create a sign, whatever. Cut it out, bake it in a 350° oven for about 3 minutes, and it shrinks to 45% of its original size. Problem with certain pencils and markers on the slick sheets? Try a light sanding (320-400 grit) before writing on it. (The surface will be more opaque.) What a fun way to make small errors become insignificant!
![]() |
92130 POLYSHRINK |
Click a phrase to shop for products associated with that phrase (AKA "Tag"). More popular tags appear bigger. Learn more »