By “the filling of vesicles in volcanic and sub-volcanic rocks by minerals deposited from hydrothermal fluids.” Also by buying this kit, which is easier and faster by thousands of years. Make your own crystal-filled rocks. Kit includes a geode mold, bag of plaster, (2) bags of alum powder, UV fluorescent dye, glow in the dark paint, stir stick and brush, and a plastic beaker. Bonuses include a poster and black-light keychain, so you can check your work.

Making stuff crystal clear is boring. Grow your own red, blue or purple crystals with these amazing Magical Crystal growing kits. You get approx 4 oz of mono-ammonium crystal, a 2-3/8" dia concave base, some appropriate food coloring flakes, a 3-3/4" x 2-3/4" dia clear plastic container, mixing stick and instructions. Ages 8+.

Sometimes the best STEM starts with slime. The Ooze Labs Chemistry Station holds chem lab components including test tubes, measuring cups, pipettes and more, ready for budding chemists to perform (20) experiments specializing in ooziness, sliminess and colorful goopy and fizzy fun. Comes with a 16-page manual. You add some common household items. For ages 6+.

Looking for some "insanely cool experiences"? With the Sick Science! Super Size Kit from Steve Spangler Science you’ll get (30) different ones, all STEM, many of them physics or chemistry-based magic tricks. Materials include plastic bottles, a bead string, rope, lots of wooden sticks, insta-snow and gravity goo powders, food coloring, fizz, tablets and filter paper. Comes with a 20-page manual and QR codes for your phone. Ages 6+.

It’s an educational air and water show! The Blow & Blast Bonanza™ from Scientific Explorer® teaches kids ages 12+ about air pressure, air density and buoyancy. They can mix chemicals that will inflate a balloon, make a lung-powered marshmallow shooter and a hover train, and test Archimedes’ principle of buoyancy. Kit includes baking soda, citric acid, (12) PVC pipes, (6) pom poms, (4) paper clips, (3) brass nuts, (2) balloons, (2) pipettes, (2) soda bottles & caps, a clear canister, a measuring spoon and an instruction booklet with (5) activities. Adult supervision is required but come on, you know it’s going to be fun for you, too.

If they're 10 or older, and mad for science, get them this Chemistry Lab Kit from Edu-Science, with chemicals, equipment and a manual for over (80) experiments. Includes copper sulfate, sodium carbonate, calcium carbonate and hydroxide, copper foil, tartaric acid and methyl orange, litmus blue powder, litmus paper, filter paper, test tubes plus holder and rack, rubber tubing, corks, beaker, funnel, small alcohol lamp, stirring rod, scoop, brush, and goggles. For ages 10 and up.

From Nancy B's Science Club, this purple-accented starter chemistry kit includes a 22-page booklet with (9) experiments, safety glasses, (4) test tubes, rack, dropper, stirring rod, funnel, plastic beaker and graduated cylinder. Kids can extinguish a flame by pouring invisible gas on it, or make bubbling "lava" in a bottle, among other experiments. You add some household items and stand back. For ages 8+.

On the heels of the Pineapple Watch, comes this H20 Clock Kit that features a digital clock powered by liquids. Includes a 3/4" LCD clock display, (2) 4" vials that hold 3 oz each, lids with prewired copper and zinc electrodes, and a base with spring terminals to wire and hold everything. And yes, it will work with soy sauce apple juice, diet cola, whatever, if water strikes you (clock joke there, no charge) as boring. Also includes a 10-page manual. Ages 8+.

Happy Atoms® is a triple crown champ in science education with a 2017 Auggie Award, a Parents' Choice Silver Award, and the 2017 KAPi Ed Tech Award. The atom and molecule game kit includes plastic atoms with magnetic electrons and bonding sites for use in (76) activities. You’ll discover the identities of (52) molecules by scanning with an app, and learn about the state of matter, bonds, molecular geometry and much more. For ages 10-17, and requires an iPhone or iPad running iOS 10 or later, or an Android device running 4.4 or later with 1GB RAM minimum with camera. Because of the camera phone tie-in, the kit becomes an on-going game.

Make a nice start at constructing your very own universe with this excellent molecule model set. You get (24) 3/4" and (25) 1" plastic balls in assorted blue, black, yellow and orange colors with varying numbers of holes for connectors; (26) white ball/rod combos to stand for hydrogen; and (27) connector rods in (3) lengths for valency bonds. Includes a chart explaining the system and a periodic table inside the sturdy storage box. Great classroom tool for ages 13 and up.