Congo Ebola Crisis: Contact Tracing Is Dangerously Behind, Officials Warn

Threat of Explosion From Toxic Chemical Tank Lessened, Officials Say

Hantavirus Doesn’t Spread Easily, but Officials May Be Downplaying Risks

The US military recently held a classified exercise to deal with a nuke in space | US officials have said a nuclear detonation would render portions of low-Earth orbit useless for up to a year.