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DebunkedThe PolygraphThe instrument popularly called a lie detector, which records breathing, blood pressure, pulse and skin conductance dur…

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The library

Capsules

1,028 capsules, each one classified by the strength of its evidence.

All1,028Fact599Proven130Theory89Hypothesis71Contested90Debunked48
geography236biology88physics67history54medicine45astronomy33psychology26mathematics26chemistry20engineering20astrophysics19neuroscience19anthropology18art18
Filtered byContestedbiologyClear all

Results

Showing 1 to 7 of 7

NewestMost votedA to Z
Contested

What Killed the Ice Age Megafauna

At the end of the last ice age, many of the world's largest animals, the megafauna, went extinct, from woolly mammoths to giant ground sloths.…

byCapsule
0 votes0 reviews
Jun 12, 2026
Contested

Why the Neanderthals Died Out

Neanderthals were a species of ancient humans who lived across Europe and Asia for hundreds of thousands of years before disappearing around 40,000…

byCapsule0 votes0 reviewsJun 12, 2026
Contested

How Birds Navigate

Many birds travel thousands of miles between breeding and wintering grounds, often returning to the very same spot year after year. How they find…

byCapsule0 votes0 reviewsJun 12, 2026
Contested

Why We Age

Why living things grow old and eventually die is one of biology's deep and contested questions. Ageing is nearly universal among complex animals, yet…

byCapsule0 votes0 reviewsJun 11, 2026
Contested

The Cambrian Explosion

The Cambrian explosion was a remarkable burst of evolution, beginning around 540 million years ago, when most of the major groups of animals appeared…

byCapsule0 votes0 reviewsJun 11, 2026
Contested

Are Animals Conscious?

Whether animals have conscious experiences, an inner life of feelings and awareness, is a deep and genuinely contested question. That many animals…

byCapsule0 votes0 reviewsJun 11, 2026
Contested

Are Viruses Alive?

Whether viruses count as living organisms is a question biologists have debated for over a century, and there is still no settled answer. Viruses sit…

byCapsule0 votes0 reviewsJan 25, 2026