This time the signal from SPOT really was sent seeking aid with a medical emergency, alerting Grand Canyon National Park rangers to a man with a fractured leg deep in the canyon.

Russian-olive can be an interesting addition to your landscape, with its dense coat of silvery leaves, bright yellow flowers, and relatively compact stature. But it also is a non-native tree that can overwhelm native vegetation, hog water, and disrupt nutrient cycles. In Utah, the National Park Foundation is helping combat this invasive by providing funding to a coalition trying to eradicate Russian-olive from public lands in the southern part of the state.

Is there one particular national park campground you like to return to again and again and again?

A congressional effort to have Pinnacles National Monument redesignated as a "national park" is opposed by the National Park Service because the monument contains a limited array of resources.