Tattooing is an ancient art that goes back centuries, but trends come and go. One rising motif in the permanent-ink culture is sacred geometry. This particular use of geometry focuses on patterns and ...

DR. JEFFREYS (NATURE, April 28, p. 267) claims that “experimental geometry” is a contradiction in terms. I protest vehemently. “Geometry” means the measurement of the earth. How can you measure the ...