Horizon/Season 10/Episode 30

Episode 29 Episode 31

S10 · E30

Dec 3, 1973 · 1 hr

An Element of Mystery

About Contact Editorial policy Discover Pricing Privacy Terms DMCA Blog

© 2026 Cinephilist

Proudly powered by

This product uses the TMDB API but is not endorsed or certified by TMDB. Some biographical and reference content is provided by Wikipedia under its applicable licenses.

Discover

Movies and TVFresh releases from across the catalog, mixed to keep movies and TV side by side.Movies TV Awards

Workspace

Watchlists My lists My reviews

Trivia

Play movie quizzes and chase the scoreboard

Play film and television quizzes, test your knowledge, and climb the Cinephilist leaderboards.

FeedEpisode threads, fan theories, polls, predictions, and moderated reports keep discussion lively without turning it chaotic.Lists

Spoiler shield

Spoiler gates protect reviews, posts, and scene notes until readers choose to reveal them.

Sign in Sign up

Your rating

Synopsis

This episode of Horizon documents the sources, uses, and properties of the element mercury and examines its role in modern society.

Reviews

Most helpful Newest Spoiler-free

No reviews yet

Reviews will appear here once members share their thoughts.

Episode discussion

Unlocks when you mark this episode as watched

Comments stay hidden until you have watched this episode.

No music yet

–

User score

No reviews yet

Across 0 community ratings

Where to watch

Availability for United States

PBS

Streaming availability data provided by JustWatch.

Advertisement