The Tomatometer rating – based on the published opinions of hundreds of film and
television critics – is a trusted measurement of movie and TV programming quality
for millions of moviegoers. It represents the percentage of professional critic reviews
that are positive for a given film or television show.
From the Critics
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The Tomatometer is 60% or higher.
The Tomatometer is 59% or lower.
Movies and TV shows are Certified Fresh with a steady Tomatometer of 75% or
higher after a set amount of reviews (80 for wide-release movies, 40 for
limited-release movies, 20 for TV shows), including 5 reviews from Top Critics.
Percentage of users who rate a movie or TV show positively.
NOVA investigates the unstable future of the Earth's magnetic fields in the episode "Magnetic Storm." Physicist Dan Lathrop leads a team of scientists at the University of Maryland who study this phenomenon. They have made a model of the Earth's iron core using more than 200 pounds of molten sodium. Geologist John Shaw at the University of Liverpool studies the iron minerals in baked clay pots. The minerals provide a historical record of the magnetic field, which has been on the decline for the last few centuries. Scientist Gary Glatzmaier at the University of California believes the Earth is preparing for another swap between the North and South Poles. This episode originally aired on PBS in November 2003.