Lego is forever. Modern Lego sets include classic worlds like Lego City, franchise collaborations with beloved characters like Super Mario, and exciting new adventures in Lego Dreamzzz, where shark ships ply the skies.

This Black Friday, we're a little obsessed with Lego. And with so many great Black Friday deals on science and STEM-themed Lego sets — including the Botanicals range, nature-themed sets, animals, space and more — we wanted to share them with you.

Whether for kids or adults, Legos make generous gifts for just about anyone on your list, and now’s the time to stock up. Below, we rounded up 21 sets worth buying today starting at just $12 — hurry and add them to your cart.