Nice little pulley unit kit includes (1) pulley each at 50, 30, 25 and 20mm and (3) pulleys at 11mm, plus myriad bushings, a 3VDC motor, (2) belts and a belt guide, base, mounts and assorted hardware. Includes graphic assembly instructions, plus a couple of rudimentary drawings with suggested projects. It's a mechanical science project waiting for a home.

Make a whole bunch of fun and instructive Lego® machines/chain reaction models like marble runs and mousetraps involving ramps, buckets, funnels balances and much more. Comes with (33) Lego® elements, (6) Lego® balls, a dozen paper props, and a 78-page instruction booklet for (10) machines. You add a few common household items. Includes suggestions for more complicated devices if you have your own Lego® pieces, and if you don't, what are you waiting for? Ages 8+.

before we dip our tongues into it. You might want to, too. Try Watersafe® Well-Water Test Kit, a robust 10 parameter, single-use kit made for testing city water or well-water. Contains tests that will detect lead, coliform bacteria, pesticides, nitrates, iron, nitrites, pH, chlorine, copper and hardness. Includes an instruction manual and EPA drinking water standards. Easy to use, with your water quality results on the spot.

Design your own planes, then fly 'em. This kit has (35) parts including balsa wings and bodies, plastic struts and landing gears, rubber-band drives and (3) props. Comes with instructions for (4) planes, including an X-wing and tri-plane, but it's made for you to experiment with your own designs. Also made to build, disassemble and rebuild different models. For ages 8+.

Budding meteorologists will love this Weather Science kit from Green Science. Includes experiments with lightning, static electricity, cloud-making, greenhouse effect, water cycles and acid rain. Comes with thermometers and holders, a balloon, seed tray, pH paper, and sundry plastic instruments. You add a few common household items.

Just like the original Stomp® Rocket but slightly smaller for slightly smaller feet, the Stomp® Rocket Jr. Glow also, you guessed it, glows in the dark. Includes (4) 8-3/4" tall foam rockets, launch tripod, 3-foot hose and the launching pad on which you or your young 'uns stomp to launch it up to 100 feet. Runs on air alone (no more waiting for your liquid hydrogen order from NASA) so it's safe. For ages 3 and up, depending upon shoe size.

We woodn't kid you; we always like wooden kits best. More organic. These are all pre-cut, unfinished pine and include nails. You add wood glue, simple hand tools and paint. This little birdhouse, which will be approx 6" long x 3-1/4" square will keep your small feather friends happy and protected from the elements. Great as a craft project by itself, or a handy science teaching aid for youngsters or young adults that are ready to be kicked out of your nest. Ages 8+.

This is an excellent starter kit for learning the rudiments of Chinese brush painting. Includes a lavishly illustrated 47-page instruction booklet, an 11-1/8" x 8-1/8" pad with (36) practice sheets and a few sheets of xuan, the vellum-like paper that brush-painting artists use, plus 5ml tubes of Chinese watercolors in white, indigo, burnt sienna, carmine and gamboge, a saffron color. Also includes (2) brushes, an ink stone and ink stick, all in a nice boxed set.

And teach a kid (8 and up) the basics of solar power. This excellent educational kit from Elenco comes with (9) 0.5VDC solar cells pre-wired in sets of (3) and mounted in a 5" x 4" x 7/16" black-plastic frame with screw terminals on the bottom. The kit includes a 1.5VDC motor with leads and a mount, a fan blade and (4) plastic discs from 5/8" dia to 2" dia for mounting on the motor shaft, a 1.5V incandescent bulb with leads, a sound module with leads, and graphic cards to mount on the discs. Comes with a 14-page instruction/experiment booklet, including info on increasing voltage and amperage, powering battery charges, radios, games, etc. Lots of science project potential. "Heuristic as all get-out," Jarvis said when he saw it. Ages 8+.

From Metal Earth®, the people who make shiny metal 3D models, now comes the Doctor Who metal models. All punch-outs with no glue or soldering required. You pick: the Golden Dalek, at 2-1/4” x 3” x 1-1/4”; or the Blue Tardis model at 1-5/8” square x 3-1/4” tall. And if you don’t know what a Dalek or Tardis  is, you shouldn’t even be reading this. These are challenging models, so rated for all ages over 14.

Extra-nifty, this 3-D sci-fi cartoon coloring set includes a 36-page pad of cartoons with (3) sets of (12) 7” x 5” sheets. Also comes with a pair of diffraction glasses, so you can see what you’re coloring, and (10) assorted markers, all in a compact book-like carrying case.

It's the classic Spirograph®, which is a lot of intricate round mandala-like designs floating around out there. Celebrate with one of our spirographic specials. You pick: the Travel Spirograph® in a flip-lid case with a 2-3/8" ID ring in the lid and (4) assorted wheels, a cross, an oblate spheroid, red and blue pens, a design guide and a 24-sheet pad of  3" square paper; the Original Spirograph®, an 11-piece set in a storage tin, complete with 3-11/16" OD ring, (6) assorted wheels, rectangle, oval rail, 24-sheet pad of  5" x 7" paper, red and blue pens, design booklet and reusable putty to hold down the paper; or the Deluxe Spirograph® with (19) assorted wheels, (2) rings, an oval rail, oblate spheroid, triangle, red and blue and green pens, a reusable putty to hold the paper, a 14-page design book and a 20-sheet pad of 8-1/2" x 11" paper.

Make like a miniature Martin Scorsese and create your own (stop-action) movie. Best part? The actors are all Lego® people, who work for free. You’ll get (36) assorted Lego® pieces, including mix-and-match characters and props. Includes a 78-page guide with advice for making credits, sound effects, lighting, camera techniques, set design, backdrops, storyboards and a bunch more. If Hitchcock had had this kit, Janet Leigh might have survived the shower scene. For ages 8+.

Could be a new line of cologne, but in fact, it’s a clever kinetic action demo kit called Wave Wires® with magnets marked for polarity, and mounted on (4) 8-1/2” long wires attached to a 4-1/4” square steel base. Includes a dozen 1/2” dia steel disc weights, an acrylic ring and an 8-page activity booklet. The attraction/repulsion magnetic properties cause the magnets to swing on top of the wires like old-time circus acrobats. Ages 8-14. Really cool, if we don’t say so ourselves.

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 for ages 12 and up.

"WE DARE YOU!" by Vicki Cobb is a 322-page book for children, filled with over (300) scientific challenges and experiments that can be done with ordinary household stuff. A savvy adult could introduce kids to science by betting them their allowance money on the afore-mentioned challenges, including making square eggs without using a square chicken, writing with potatoes, blowing frozen soap bubbles, and a whole bunch more.

Could be lilliputian versions of Heidi Klum and Naomi Campbell, but they’re not. They’re dandy little 37-piece (mostly) steel model kits of two different racers, a biplane or a helicopter, from Steel Works. Finished models will be a couple of inches long, and a tiny tool for assembly is included. We’ll pick one that will be just right for you. Ages 8+.

It's small, as actual solar systems go, and you have to assemble it, but still…. You snap together this (not-to-scale) model of our solar system, paint it, and position the pieces. You get (6) colors plus a tube of glow-in-the-dark paint and a brush, the (8) planets (Pluto didn't make the cut, remember), and cardboard rings for Saturn. Sizes range from just under 1/2" for Mercury to the 1-7/16" sun. The finished model is articulated and stands approx 4" tall x 12" across on a 3-7/8" dia gray plastic base. Ages 8+.