If you're leaving home at dawn to spend the day making observations in a misty forest or just enjoy taking your coffee with you wherever you go

With a deep blue background featuring white diagrams of the night sky in both hemispheres

take geology notes

Cool evening after a hot day

if it's too cloudy to stargaze

Equations That Changed the World Whiskey Glass Size:Single If you're leaving home atThis whiskey glass celebrates some of the equations that fundamentally changed the way we understand our world. Let it inspire you to dive deeper into your work, complete that problem set, or find creative ways to work out your proof. Raise a glass to mathematics with this Equations That Changed the World Whiskey Glass.