Science video summaries

Quick answer

The most watched science videos on YouTube, summarized in our own words. Each one shows the upload date and views, the answer to the title, a verdict, 5 takeaways, and Actionable and Lessons tabs. Sorted by views.

What 125x is: 125x is a web app at 125x.app. You connect your YouTube subscriptions, and it gives you a feed of the latest videos from the channels you follow, each with a summary: a verdict, the 5 key takeaways, and the spoiler, plus Actionable and Lessons tabs with more tips. You read that and decide what's actually worth opening.

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Popular science videos, summarized

The Closest Thing We Have to Alien TechnologyVeritasium · Verdict: Good value given
Uploaded Dec 31, 2025 · 64.9M views (as of Oct 30, 2026)

The Banach-Tarski ParadoxVsauce · Verdict: Good value given
Uploaded Aug 1, 2015 · 49.1M views (as of Oct 30, 2026)

Which Way Is Down?Vsauce · Verdict: Good value given
Uploaded Nov 2, 2017 · 31.8M views (as of Oct 30, 2026)

The Black Hole Bomb and Black Hole CivilizationsKurzgesagt · Verdict: Good value given
Uploaded Apr 22, 2018 · 29.5M views (as of Oct 30, 2026)

How High Can We Build?Vsauce · Verdict: Some value given
Uploaded Jun 3, 2012 · 29.5M views (as of Oct 30, 2026)

The Zipf MysteryVsauce · Verdict: Good value given
Uploaded Sep 15, 2015 · 28.7M views (as of Oct 30, 2026)

The Most Dangerous Stuff in the Universe - Strange Stars ExplainedKurzgesagt · Verdict: Good value given
Uploaded Apr 14, 2019 · 24.2M views (as of Oct 30, 2026)

There Is Something Faster Than LightVeritasium · Verdict: Good value given
Uploaded Dec 19, 2025 · 17.3M views (as of Oct 30, 2026)

The US Military's Worst IdeaVeritasium · Verdict: Good value given
Uploaded Dec 21, 2022 · 16.2M views (as of Oct 30, 2026)

Black Hole Star: The Star That Shouldn't ExistKurzgesagt · Verdict: Good value given
Uploaded Dec 15, 2022 · 15.8M views (as of Oct 30, 2026)

The Most Controversial Idea In MathVeritasium · Verdict: Good value given
Uploaded Apr 2, 2025 · 15.1M views (as of Oct 30, 2026)

The Impossible Reality Inside a Black HoleAstrum · Verdict: Some value given
Uploaded Oct 29, 2026 · 374.8K views (as of Oct 30, 2026)

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How 125x does this for your feed

This page is one sample of what 125x does for every video in your feed. 125x pulls in your YouTube subscriptions automatically, so there's nothing to set up. Each new video gets a watch, skim or skip verdict, 5 takeaways, the answer to the clickbait title, and Actionable and Lessons tabs.

View your YouTube feed at 125x speed. YouTube summaries of every video in your feed.

FAQ: questions people ask

Which science videos are summarized here?

Popular science videos from well known YouTube channels, sorted by views. Each card links to a full summary and the original video.

Are these summaries written from the videos?

Yes. We go through each video's transcript and write the summary in our own words. Any quotes are copied word for word.

Can I get summaries of new science videos from channels I follow?

Yes. 125x pulls in your YouTube subscriptions automatically and summarizes each new video in your feed.