The world-famous primatologist discusses her new book, which is back on shelves after some controversy.
Supplies of oil have been surging this year, and U.S. drivers, who have been switching to more fuel-efficient cars, are using less gasoline.
That would seem to be the right economic combination to push down prices at the pump, but gasoline prices have remained stubbornly high.
Gasoline is averaging about $3.60 for a gallon of regular.
With summer beginning tomorrow, millions of vacationers will be taking to the roads.