with the perfect blue-spruce pop-color inside

this muscle-inspired hardcover notebook is just what you’ve been looking for

this grown-up version is ready to help you hydrate before a long day of mammalian observation

cells and photosynthesis diagrams

The Ripple Mark Pen baking science with the perfect blue-spruce pop-colorRipple marks are patterns left below moving water or wind, and by studying them, scientists can learn a lot about the area's geography. These patterns can tell us about the depth of water above the ocean floor or riverbed, which direction the flow of water or air was going, how fast, whether there were waves or storms, and a whole lot more. The Ripple Mark is a capped metal body pen with textures reminiscent of ripple marks. Use it to conquer your