Equations That Changed the World Eco Martingale Collar Size:Medium This mug features some of

This mug features some of your favorite grassland animals

Decorate your space with an earth colored and slate blue art print

Steep yourself the perfect elixir

or keep records of your forraging adventures within the pages of this elegant notebook

In addition to being printed with glorious full-color designs in over 20 different scientific disciplines

Equations That Changed the World Eco Martingale Collar Size:Medium This mug features some ofThis math inspired collar is great for accessorizing your favorite fuzzy friend while you work on your problem sets. Martingale collars are what you need if your dog's head is smaller than its neck like a greyhound or a whippet, any dog prone to slipping their collar, or dogs with delicate tracheas and necks like chihuahuas and pomeranians. Our Martingale collars are available in three sizes, adjustable, and built with rPET webbing (made from recycled