Episode Ratings Grid

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Episode Power Rankings

The peaks and the valleys. Find the essential episodes — and the ones to skip.

#1
S8E4 9.0
Anatomy of a Volcano

When Mount St. Helens erupted earlier this year, it focused the attention of the whole world on the almost incredible destructive forces that volcanos can release. Geologists from around the world congregated at the volcano and NOVA joined the vigil for an in-depth look at the incident and its aftermath.

#2
S14E2 9.0
Children of Eve

NOVA examines a controversial theory that traces our ancestry to a small group of women living in Africa 300,000 years ago.

#3
S14E7 9.0
Confessions of a Weaponeer

Harvard chemist George Kistiakowsky was an anti-Bolshevik soldier in 1919 Russia, an atomic bomb scientist at Los Alamos, a presidential advisor in the Eisenhower White House and an arms control activist. Shortly before Kistiakowsky death, he recounts his eventful career to interviewer Carl Sagan.

#4 NOVA Wonders: What's Living in You? S45E102 8.9
#5 Life on a Silken Thread S6E12 8.8
#6 Pioneers of Surgery: The Brutal Craft (1) S15E12 8.8
#7 Pioneers of Surgery: Into the Heart (2) S15E13 8.8
#8 Pioneers of Surgery: New Organs for Old (3) S15E14 8.8
#9 Pioneers of Surgery: Beyond the Knife (4) S15E15 8.8
#10 So You Want to Be a Doctor? S18E12 8.8

Lowlights

#739 S22E20 Treasures of the Great Barrier Reef 5.5

Recording sights that will astonish even experienced divers, NOVA documents an extraordinary day in the life of the largest coral reef in the world, capturing for the first time the annual spawning of coral and other unusual creatures of the reef.

#738 Critical Condition: Health in Black America S52E9 5.7
#737 In the Land of the Llamas S17E19 5.8
#736 Building on Ground Zero S33E12 5.9
#735 Why Sharks Attack S41E11 6.1

The Quality Arc

Each point is an episode, plotted in order. Colored bands mark season boundaries. Look for the rise, the plateau, or the decline.

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Episode Engagement

High votes + high rating = beloved classic. High votes + low rating = notorious stinker. Low votes + high rating = hidden gem.

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Series Trajectory

One point per season. Smooths out the episode-to-episode noise to reveal the bigger arc.

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Season Momentum

Did each season build or fizzle? Green means the finale outscored the premiere. Red means the opposite. Longer arrows, bigger swings.

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Season Consistency

How steady is each season? Tightly clustered dots mean reliable quality. Scattered dots mean a wild ride.

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