Zivko the Robot. Our best selling STEM kit ever! Just call her (or him--it’s unclear and we don’t like to ask) “Zivko” because “the Robot” is her last name. Using just a screwdriver and side cutters, you build Zivko from this 107-piece S.T.E.M. kit. Set the mode for “Follow Me” or “Explore,” and Zivko will, yes, track you, or evade obstacles, respectively, via an infrared sensor and micro-controller programming. Interactive LEDs and sounds abound. Measures approx 5" x 5-1/2" x 6-1/2" when assembled with all (6) legs. You add (4) “AA”s for power, which is the least you can do for someone this cute. Ages 10+.

Jigsaw puzzles were invented over 250 years ago and these 1000-piece puzzles should only take you about half that time to complete, which is why we’ll send you (2) different ones. These 20” x 27” puzzles feature art by famed fantasy artist Nene Thomas and are made in the USA. We’ll select from: “Dragon Witch Severeielle” with a fierce-looking red dragon perched on her shoulders; “Wind Moon” with a fairy in blue seated upon a crescent moon along with her black cat; or “Bellamaestra, Lady of Pain” featuring a black dress/armor-clad lady with her wolf and dragon. Plus, each puzzle includes a 6” x 8-1/4” mini-poster of the artwork.

Pop one of these roughly 1-1/4" dia stones into the toe of a sock, smash it with a hammer, and be the first person ever to see your real-as-Nature-makes-it geode!! Ninety percent of them have the familiar beautiful white crystals inside. Formed by volcanic action, they are found all over the world, but ours are from Mexico. There is no way to tell from the outside if they have crystal centers, but we will send you two just to raise your odds, and we haven't had a dud yet in our stores!! Much much more fun and satisfaction than buying one already cracked.

Go on, take a chance with Futurama Universe X from Kidrobot®. For less than the price of a chicken and waffle slider, we’ll send you a blind, sealed pack, possibly with with one of the Frys, Leelas, Benders or Zapps, or Dr. Zoidberg, Morbo, Hedonism Bot, Roberto, Calculon, Slurms or Robot Devil, among others. We don’t know what’s in the blind pack and neither will you until you open it…you know the drill, right?

It doesn't get much cooler in the robotic-arm-kit game. The assembled STEM educational arm is 15" tall x 9" long x approx 3-1/2" wide. It's 2-pronged hand opens to 1-3/4", lifts up to 3.5 oz (100g), swings 120 degrees at the wrist, pivots 300 degrees at the elbow, and sits on a base that swings 180 degrees up and down and rotates 270 degrees, like, well, an arm. Controlled by (5) 2-axis joy-sticks and powered by (4) D-Cell batteries that you provide. Includes a hand-mounted search light and over-torque and gear-breakage alarms, which is more than your arm has. Requires a diagonal cutter and Philips screwdriver for assembly of its 200+ pieces and is made for ages 12 and up.

And we say that with a history of silly that’s virtually unmatched. You slip on this pair of lens-less glasses with the tiny bucket and ball on a string attached, and try, while looking like a demented chipmunk, to swing the little ball on its cord and drop it into the cup. In red and blue plastic, you will be filmed on a smart phone, it will be put on social media, and you will be famous for it for the rest of your life. Best to order a couple so you’re not alone.

Yes, we have The Amazing Live Sea Monkey® aquarium kit, just like the ones from the comic books. The (9) piece ocean zoo includes brine shrimp eggs, growth food, water purifier, plus an official plastic feeding spoon, 32-page handbook, life insurance policy, growth guarantee, and the plastic aquarium with built-in magnifiers for viewing your little friends, and a vented cover. Great gift for those budding young marine biologists. Ages 6+.

Or the Swanee whistle. Whatever you call it, this little slide whistle (just consider it the smallest trombone in the universe) has an outsized musical history. No elevator has ever fallen in a cartoon without its accompaniment, and no jug band is complete without one, but Louis Armstrong also played one on his Hot Five recordings, and Ravel even required one in an opera score. In assorted plastic colors with a steel slide, 6-7/8" long x 1/2" dia.

Just the one, actually, but it’s been sliced in half so the pair is perfectly symmetrical and mighty pretty. Although ammonites have been extinct for 65,000,000 years, we’ve got their approx 1” dia fossils for you. Our each is a book-matched pair of polished ammonites fossils of a single critter halved and polished to a bright symmetrical shininess. The colors vary from light tan to dark brown and we’ll pick because we have impeccable ammonitical color-shade taste. And yes, they’re just screaming to become cuff-links or earrings.

Don’t you like having a thousand of something? Yeah, same here. We recommend this bag of 1,000 (we did the math, that's only 2.4 cents per marble) glass cat’s eye marbles in a rainbow of colors. Called Peewees in the marble world, they’re 12mm dia, which is 0.47”, which is like a really big pea, or a really small garbanzo bean. Play mini-marbles, or make clay cats and use the marbles for eyes, or just keep them in a big bowl for their prettiness factor.

This puzzle’s in our pocket, and yes, we’re excited to see it. You will be, too, because it will help you finally memorize the symbols for all of the lanthanides and actinides. Imagine a very detailed, full-color periodic table composed of (150) pieces, each of which would just about cover the thumbnail of an adult copywriter. Assembled, it’ll measure approx 6" x 4". Also comes with a 4-1/2" x 3-1/8" periodic table chart, and it all travels nicely in a clear 6” x 1” tube with a screwcap.

About 30-40 highly polished stones, all shiny, translucent, or brightly colored, ranging from 3/4" long to 1/8" long. Great for mosaics, jewelry, or aquariums.

2" flywheel in a well-made metal frame. The trick is the same as it has been for 100 years. Wind the string through the spindle, pull it firmly to set the flywheel spinning, and perform effortless balancing magic on pencil tips, string tightropes, and the like. We tend to forget that bicycles and aircraft navigation both rely heavily on gyroscopic principles. It's never too early to tell the kids. Besides, it's fun.

Imagine the family competitions you could have with this floating ball game. Hours of fun, minutes at a time! The wooden pipe is approx 6” long, and the 1-3/8” Styrofoam balls are yours to levitate through the magic of steady breath and balance. Oh, the wonders! Ages 4+.

No maybes. Our each is a set of matching “YES” and “NO” buttons, a little over 3" in dia, like on quiz shows. When smacked, they recite one of (10) variations on the theme, as in “No, no, no, no” or “Yes, baby.” or “For the last time, NO.” Perfect for arbitrary decision-making at work and excellent for responding to requests from teens. You add a couple of “AAA” batteries and the buttons do the rest.

Here's a little music box to crank. These are really cute, with a very nice sound, and they're in clear acrylic cases so you, or impressionable youngsters, can watch them work. They measure 2-1/4"x 2" x 1-1/4" with a 7/8" crank. We'll pick one that plays When You Wish upon a Star, Row, Row, Row your Boat, Brahms' Lullaby, or Twinkle, Twinkle, Little Star. We won't pick the one that plays the score from Die Walküre because the wheel is just enormous.

Special for your beginner tootler. Our black (ABS plastic) soprano recorder measures 12-5/8" long and includes a plastic carrying case, cleaning rod, and a sheet of fingering instructions.

More fun than a canned ham, this flip-top storage tin has a train set inside, with a plastic steam engine, tender, boxcar and caboose, as well as a 12-piece track that forms a 10" x 22" oval. You add a "AA" battery and you're the engineer.