Spears topped Yahoo's search ranking for the second year, representing the sixth time in seven years that the troubled singer has held the top spot.
Yahoo's 2007 annual search report dropped a single top 10 list in favour of categorised rankings including topics such as sports, news, technology and celebrity gossip.
The global environment was also a hot search topic in 2007. Yahoo reported 'recycling', 'global warming' and 'freecycle' as its most popular green searches.
Popular culture dominated the top overall searches, but Yahoo stressed that these topics are not necessarily those to which surfers pay the most attention.
"Remember that we search because we want more information about something that we do not get from our regular sources."
New light-guiding nanoscale device can control and monitor a nanoparticle trapped in a laser beam with high sensitivity
Optical traps are scientific instruments in which a focused laser beam is used to exert an attractive or repulsive force on a microscopic object to hold it in place
Scientists estimate that the exoplanet has already lost up to 35 per cent of its mass over its lifetime
The observations were made using the Atacama Array in the Chilean desert
J1043+2408 was observed for more than 10 years, and its radio light curve exhibited a periodic signal repeating in about 563 days