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There are geeks, and there are nerds. This is a very important distinction when it comes to holiday gifting. Does your target obsess over video games, watch more Crunchyroll than Netflix, and consume fan fic on Reddit, or do they like to casually build robots to feed you your dinner? If it's the latter, you should check out these great gift ideas that are on sale for an extra 15% off during our Pre-Black Friday Sale. Any one of 'em will keep your beloved nerd busy while you take your holiday nap.

Bioluminescent Bio-Orb, $38.24 (reg. $49) with promo code SAVE15NOV

Filled with bioluminescent dinoflagellates, this eerie orb will produce natural light at night whenever you swirl it around. It's like a witch's crystal ball except it uses scientific principles and won't predict the future.

DIY Building Block STEM Drone, $42.49 (reg. $129) with promo code SAVE15NOV

This simple kit comes with everything you need to assemble a drone and then start flying it yourself right away so you can live out all your James Bondian dreams.

WiFi Digital Microscope, $47.56 (reg. $69) with promo code SAVE15NOV

Make at-home science cool with this digital microscope that can magnify from 50x to 1,000x in incredible detail. It's equipped with eight LED lights to properly illuminate subjects and connects to your devices via Wi-Fi so you can display all that gross stuff that lives on your hands completely wirelessly.

Sky Lite Laser Galaxy Projector, $50.99 (reg. $59.99) with promo code SAVE15NOV

For the nerd who likes to party, this laser projector shines a whole universe of stars against a drifting blue nebula cloud. With a tilting design, you can shine the effect on walls or the ceiling to transform any room into an intergalactic disco.

The STEM Starter Bundle: Robotic & Curiosity Kits, $67.99 (reg. $119) with promo code SAVE15NOV

For STEM-interested kids, this LEGO-compatible toy fosters natural creativity and curiosity with design tech tools. The bundle includes the Robotic Kit, designed for kids ages 5-8 to build their own projects, and the Curiosity Kit, designed for kids ages 7-10 to develop problem-solving skills and analytical thinking.

Planetary System Set, $93.46 (reg. $129) with promo code SAVE15NOV

This baby's like the grown-up version of that solar system mobile you made in sixth grade. The planets in this set are designed to look as accurate and beautiful as possible using NASA satellite images, so you can be sure that that speck really is on Uranus.

Smart Nano Bots PCB Construction Set + Toolkit, $110.46 (reg. $179) with promo code SAVE15NOV

Create your own little robot army with this Kickstarter- and Indiegogo-funded kit! It comes with the motors, sensors, and robotic pieces you need to build robots from scratch and set them loose to do your bidding.

The Original 8-Planet Color Lamps Set, $127.49 (reg. $160) with promo code SAVE15NOV

This 3-D printed lamp set will light up the life of your local amateur astronomer with detailed designs meticulously crafted from NASA imagery.

Rotate(R) DIY Watchmaking Kit, $144.49 (reg. $225) with promo code SAVE15NOV

For anyone who's ever said, "Watchmaking is a really interesting skill," this kit comes with all the materials and tools needed to build this beautiful watch from the gears up.

POWERUP 4.0: App-Controlled Paper Plane 2-Piece Bundle, $140.24 (reg. $189) with promo code SAVE15NOV

Normal paper planes are lame! This app-controlled paper plane folds together and uses a little app-controlled motor to make it way more fun to fly than just chucking a piece of paper.

Toybox 3D Printer Deluxe Bundle, $297.50 (reg. $469) with promo code SAVE15NOV

If you know a kid who'd rather make their own toys than wander slack-jawed through whatever they have instead of Toys 'R Us now, encourage that creativity with this kid-safe 3-D printer. It comes with everything required to virtually design and then print toys into reality because children should get to play God, too.

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