"The legend around this chalk is that it's impossible to write a false theorem using the chalk, but I think I've disproved that many times," says David Eisenbud, a mathematics professor at the University of California at Berkeley.

Plaza Japan is the leading online retailer of authentic anime merch, Japanese action figures, plastic scale model kits, and more. Shop our collection today!

感動とサプライズをテーマに、高品質な商品を提案し、世界に通用する価値ある企業を目指します。