Just how big can a snowflake get? It depends on what you mean by 'snowflake' The Guinness World Record folks would have us believe in a 19th century snowflake more than a foot wide, but some scientists are skeptical. Nell Greenfieldboyce
How the real-life Rudolphs get enough rest: Sleep while you chew! Scientists say reindeer seem to sleep while they chew, allowing them to forage all day in the summertime and still get enough sleep. Ari Daniel
How do you find delicious treats in the snow? Ask the reindeer Reindeer have to dig for food in dark, snowy conditions during winter. Their vision is adapted to make that task less challenging. Alejandra Marquez Janse
What's going on in our brains when we experience nostalgia? What's going on in our brains and bodies when we experience waves of nostalgia in the holiday season? We talk to musician and neuroscientist Daniel Levitin about the medicine of music. A Martinez
The murderous creature you live with is a murderous creature, study confirms More scientific evidence has surfaced to show that while mittens may be your sweet angel, letting her roam outside is also a big threat to biodiversity. Manuela López Restrepo
Scientists have found the mostly intact skull of a giant, deadly sea reptile The pliosaur, which existed millions of years ago, would chomp down with its 130 teeth in a bite far stronger than a crocodile's and had a third eye for locating prey. Joe Hernandez
Can anything stop the toxic smog of New Delhi? It's, considered the world's most polluted megacity. The air is so bad that a new report estimates that on average each resident loses 12 years of life. Here's what they're doing about it. Ilma Hasan
A small study offers hope for people with traumatic brain injuries A study suggests that deep brain stimulation can improve focus and attention in people recovering from a traumatic brain injury. This could offer a path for those living with debilitating impairments. Jon Hamilton
Washington state population tops 8 million and it's not getting any younger The state of Washington has reached 8 million people, and it's growing twice as fast as the national average. Diana Opong
Holy Mole-y: A sniffer dog helps rediscover a rare mole The De Winton's Golden mole was last spotted in 1936. But with the help of a mole-sniffing dog and new environmental DNA analysis, researchers are taking it off the most wanted lost species list. Vanessa Romo
