The Signal SPARC publishes a monthly newsletter titled “The Signal.” You can browse the current and past issues below. Signal / 2021 / TypeDrawer/FileDate Modified pdfApr2021 10:03 pm 04/13/2021 pdfFeb2021 11:18 pm 02/09/2021 pdfJan2021 11:04 pm 01/10/2021 pdfMar2021 10:45 pm 03/09/2021