Dogs Can Smell Human Emotions Like Fear and Happiness

When humans feel fear, stress, or joy, they release distinct chemical signals through sweat. Dogs can detect these hormonal changes — like elevated cortisol or adrenaline — and adjust their own behavior accordingly.

Source

https://www.science.org/doi/10.1126/sciadv.abn1026

Details

Published: April 1, 2026
views: 73

Dog Animals Science Biology

Related Facts

Weird101 views

Cats Have a Hidden Third Eyelid

Cats, like most birds, fish, reptiles, and amphibians, possess a nictitating membrane — a translucent third eyelid that moves horizontally across the eye from the inner corner. Normally hidden in healthy, alert cats, it becomes visible when a cat is drowsy, ill, or under stress. Humans lost this structure through evolution.

Weird95 views

Rubber Bands Last Longer When Stored in the Refrigerator

Natural rubber degrades primarily through oxidation — a chemical reaction with oxygen in the air. Cold temperatures significantly slow this process. According to van't Hoff's rule, every 10°C drop in temperature roughly halves the reaction rate. Storing rubber bands in the refrigerator (not the freezer) can extend their lifespan by years.

Weird75 views

Pando Is the Oldest and Heaviest Living Organism on Earth

In Utah's Fishlake National Forest, a clonal grove of quaking aspen trees named 'Pando' (Latin: 'I spread') consists of about 47,000 individual stems that are genetically identical, sharing a single root system. Weighing approximately 6,000 metric tons and covering 43 hectares, it is estimated to be 80,000 years old.

Weird65 views

Chameleons Change Color to Communicate, Not to Camouflage

Chameleons are not actually great at camouflage — their resting color already blends with their surroundings. Rapid color changes serve primarily as social signals: males flash bright colors during courtship or to threaten rivals, dark tones indicate fear or submission, and bright hues signal excitement. A 2014 study by Stuart-Fox confirmed communication as the primary function.