White House chief of staff Susie Wiles has been diagnosed with early stage breast cancer but plans to continue working through her treatment, retaining her place as one of President Donald Trump’s closest aides. The 68-year-old Wiles announced Monday she'd been diagnosed over the previous week. Wiles is the first woman to hold her position. Wiles sat alongside Trump at a meeting of the Kennedy Center board of trustees Monday. Trump describes Wiles as “one of the strongest people” he knows and says her prognosis is “excellent.” Wiles' diagnosis comes as the Republican president confronts mounting challenges on global and national fronts. Wiles led Trump's 2016 effort in Florida.

Every year, math nerds and dessert enthusiasts unite to celebrate Pi Day on March 14, a date whose digits represent the first three digits of the mathematical constant pi. The holiday was created in 1988 by Larry Shaw, a physicist at the Exploratorium science museum in San Francisco. In school, you might have used it to calculate the area of a circle or the volume of a cylinder, but the applications of pi are endless and part of every corner of our world. Pi is involved in every step of aerospace engineering and is also on the cutting edge of medical research.