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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 bymammalsClear all

Results

Showing 1 to 13 of 13

NewestMost votedA to Z
Fact· Empirical

Platypus

The platypus, Ornithorhynchus anatinus, is a semiaquatic egg-laying mammal of eastern Australia. It lays eggs, produces milk without nipples, detects…

byCapsule
0 votes0 reviews
Aug 7, 2026
Fact· Empirical

Horse

The horse, Equus ferus caballus, is a large grazing mammal domesticated on the Eurasian steppe and, for roughly four thousand years, the fastest way…

byCapsule0 votes0 reviewsAug 7, 2026
Fact· Empirical

Bat

Bats, the order Chiroptera, are the only mammals capable of powered flight. There are more than 1,400 species, roughly a fifth of all mammal species,…

byCapsule0 votes0 reviewsAug 7, 2026
Fact· Empirical

Chimpanzee

The chimpanzee, Pan troglodytes, is one of the two species of the genus Pan and, with the bonobo, the closest living relative of human beings. It is…

byCapsule0 votes0 reviewsAug 7, 2026
Fact· Empirical

Wolf

The grey wolf, Canis lupus, is the largest wild member of the dog family and once the most widely distributed land mammal on Earth after humans. It…

byCapsule0 votes0 reviewsAug 7, 2026
Fact· Empirical

Polar Bear

The polar bear, Ursus maritimus, is the largest living land carnivore and the only bear classified as a marine mammal. It is a very recent species…

byCapsule0 votes0 reviewsMay 24, 2026
Fact· Empirical

Lion

The lion, Panthera leo, is the only truly social cat and the second largest after the tiger. It once ranged from southern Africa through the Middle…

byCapsule0 votes0 reviewsApr 9, 2026
Fact· Empirical

Elephant

Elephants are the largest living land animals, and there are three species rather than the two most references still give. They have the longest…

byCapsule0 votes0 reviewsMar 15, 2026
Fact· Empirical

Tiger

The tiger, Panthera tigris, is the largest living cat, a solitary ambush predator of Asian forest, grassland and mangrove. It occupies something like…

byCapsule0 votes0 reviewsMar 1, 2026
Fact· Empirical

Giant Panda

The giant panda, Ailuropoda melanoleuca, is a bear that eats bamboo. That sentence contains the whole problem: it has the digestive system of a…

byCapsule0 votes0 reviewsFeb 26, 2026
Fact· Empirical

Domestic Cat

The domestic cat, Felis catus, is the most numerous small carnivore on Earth, with something over six hundred million individuals. It is also barely…

byCapsule0 votes0 reviewsFeb 26, 2026
Fact· Empirical

Giraffe

The giraffe is the tallest living land animal, at up to about five and a half metres. Almost everything distinctive about it follows from that…

byCapsule0 votes0 reviewsFeb 14, 2026
Fact· Empirical

Kangaroo

Kangaroos are large marsupials of the family Macropodidae, endemic to Australia and New Guinea. They are the only large animals that hop as their…

byCapsule0 votes0 reviewsFeb 11, 2026