Looking for a cool gift for someone mathematically inclined? An unusual, conversation-generating token of appreciation? The World Wide Web offers a number of intriguing possibilities–if you know where ...

Ever since I became interested in math, I’ve always wanted a Klein bottle. It therefore comes as no surprise that ever since receiving one, I’ve been completely enthralled with it. I stare at it every ...

Visually, the “Klein bottle” doesn’t seem all that impressive. On first glance it looks like a trendy Japandi-style vase. And yet it has fascinated mathematicians for more than 140 years. To ...