The universe's invisible dark matter might swirl into spinning clumps laced with countless tiny vortices, new theoretical work suggests. The findings, published May 30 in the journal Physical Review D ...

Scroll down to see the full map. On average, the United States reports more than 1000 tornadoes every year, a higher total than anywhere else in the world. That huge number is due at least in part to ...

Tornadoes were spotted around the Navajo Nation and at least one touched down near a community in southeastern Utah. Tornadoes are rare in Arizona, but as many as four to six develop each year, ...