FactCrumbs — bite-sized, real answers to “wait, why is that true?”
Why Do Cats Make Biscuits on Me? The Evidence
Kneading is a familiar cat habit and a thinly studied one. Experts say much of the explanation is still theory. Here is what each source supports.
MammalsAfrican Wild Dog: GPS Data Found a 15.5% Kill Rate, Not 80%
A 2016 GPS and accelerometer study found individual African wild dogs catch prey on just 15.5% of attempts, undercutting the 80% figure conservation groups still repeat.
Prehistoric LifeWhat Is a Hadrosaurid? Inside the Duck-Billed Dinosaur Family
Hadrosaurids ran Late Cretaceous ecosystems with dental batteries and resonating crests. A 2025 Science paper on fossil 'mummies' even found hooves.
MammalsHow High Can Cats Jump? The Real Numbers
A housecat's standing jump runs roughly five to six times its own body length, and a 2002 hind-limb study explains why. A 2025 Guinness record adds the extreme case.
MammalsHorse Gait: 1878 Photos Proved Painters Wrong
The real beat counts and speeds behind each horse gait, the 1878 trip-wire photos that proved centuries of paintings wrong, and why horses switch gaits exactly when they do.
MammalsAre Dogs Smarter Than Pigs?
A 2019 study raised pigs and dogs under identical conditions, then tested both. Dogs read a pointing gesture on the first try; every pig missed it and did something else instead.
Earth ScienceStalagmite: The 2025 Study That Finally Explained Their Shape
The 2025 study that finally explained why stalagmites form columns, cones, or flat pedestals, plus how slowly they grow and what a Chinese cave revealed about 75,000 years of climate.
Earth ScienceWhat Is an Index Fossil, and Why Isn't T. Rex One?
An index fossil has to be short-lived, abundant, and spread across the globe, three tests the most famous dinosaur that ever lived actually fails.
Earth ScienceComposite Volcano: Why a Small Eruption Killed 23,000
A composite volcano's layered structure, how its eruptions actually work, and why a much smaller 1985 eruption in Colombia killed far more people than Mount St. Helens did in 1980.
MammalsWhy Do Dogs Howl? It Depends on the Breed
Wolves and dogs share the same 150-to-780 Hz howl, but a 2023 study found only some breeds still answer it, tied to how genetically close they are to wolves.
MammalsDhole: A Wild Dog That Calls in Two Pitches
The dhole isn't closely related to wolves, and its whistle-like call often carries two independent pitches at once, a real bioacoustics finding, not a description.
Earth ScienceThe Largest Desert in the World Is Made of Ice
Antarctica, not the Sahara, holds the title, the precipitation rule that decides it, and why the Kalahari Desert and the Kalahari Basin don't even agree with each other on size.