Pima County has one of the highest rates of congenital syphilis in the nation and its health department is urging widespread testing, particularly for pregnant women who are at risk of a stillbirth if ...

Graphs are everywhere. In discrete mathematics, they are structures that show the connections between points, much like a ...

It remains to be seen whether the three big nuclear powers are headed into a new arms race, or whether President Trump is trying to spur negotiations on a new accord now that a last Cold War treaty ...