Warm air rises, but it also expands because air pressure decreases with height. The latter effect wins out and air becomes ...

UC Davis professor Hugh Safford found the highest living tree in California on a recent hike through the High Sierra.

Scientist finds Jeffrey pine trees at record mountain heights, suggesting climate-driven shifts in Sierra Nevada.

A UC Davis professor's pleasure hike in the High Sierra turned into a new elevation record for California's highest tree, the ...

TSA procedures can vary wildly by airport or day. If you’re confused about whether to take off your shoes or unpack your ...