27 Feel-Good Facts That Will Brighten Your Day

Dolphins use unique signature whistles to identify themselves and one another, functioning much like individual names.

Smiling is contagious. Seeing someone smile, in person or in a photo, can trigger a response in your brain that makes you want to smile too.

Sea otters hold hands (technically, paws) while they float and sleep, and often wrap themselves in kelp so they don't drift apart from the group, known as a 'raft.'

Cows form close friendships with other cows and can become stressed when separated from their preferred companions, according to animal behavior research.

The oldest known piece of chewing gum is a lump of chewed birch bark tar found at Huseby Klev in Sweden, estimated to be nearly 9,000 years old and still bearing tooth imprints.

Hugging releases oxytocin, a hormone linked to reduced stress and lower blood pressure.

According to Guinness World Records, the largest snowflake ever reported was 15 inches wide and 8 inches thick, said to have fallen near Missoula, Montana, in 1887 — though scientists have questioned whether a snowflake that large is physically possible.

Male penguins, including Gentoo and Adelie penguins, will search for a smooth pebble to offer a potential mate as part of their courtship.

Newborn babies blink far less often than adults — sometimes only once or twice a minute during the first months of life, compared to 10-15 times a minute in adults.

A small study found that 10 to 15 minutes of laughter can burn up to 40 calories, depending on body weight.

Elephants have demonstrated self-recognition in mirror tests, a trait shared with humans and great apes.

There's a word for the smell of rain on dry earth: petrichor, coined by scientists in 1964.

One of the longest recorded hugs lasted over 32 hours, achieved by two friends in Oklahoma in 2015 as a Guinness World Records attempt.

Research suggests dogs can remember past events and anticipate future ones, showing a form of time-related memory.

Happiness can spread through social networks — a long-running Framingham Heart Study found people are more likely to be happy when those around them are happy.

A group of flamingos is called a 'flamboyance.'

Penguins do have knees — they're just tucked inside their bodies and hidden by feathers.

Maintaining a positive outlook has been linked to better physical health outcomes, including a stronger immune response.

Squirrels have been documented adopting and nursing orphaned squirrel kits that aren't their own.

The world's oldest cat on record, Creme Puff of Austin, Texas, lived to be 38 years old and held the Guinness World Record until her death in 2005.

Oysters can change sex, often starting life as male and later becoming female depending on environmental conditions like temperature and food availability.

Hugging someone you love has been linked to lower blood pressure, which over time can support heart health.

A cat's purr typically falls in a low-frequency range that some researchers believe may help promote healing and bone density, alongside its calming effect.

Elephants have been observed gathering around and gently touching the bodies of deceased herd members, behavior many researchers interpret as mourning.

Honey has such low water content and high acidity that it essentially never spoils — archaeologists have found edible honey in ancient Egyptian tombs.