In some remarkable cases, people have survived after their core temperature has plummeted into the 50s. The human body needs to maintain the same internal body temperature or else many vital systems fall apart. Breakthroughs, discoveries, and DIY tips sent every weekday. Whether you prefer sweltering summers or frigid winters, significant temperature changes mean only one thing to your body: bad news. Humans are homeotherms, meaning that our core body temperature stays roughly constant.

Why our bodies shake when it's cold. Involuntary muscle contractions keep us warm and even fight infections. "Shivering is a way for our bodies to generate heat when we are cold," says Dr. Natasha Bhuyan, a family physician based in Phoenix, Arizona. Breakthroughs, discoveries, and DIY tips sent every weekday. You're walking down a Chicago street on a blustery winter day, when a particularly strong wind almost whips you off of your feet.

Fear isn't just personal--it spreads through sight, smell, and even subconsciously. Horror movies may be scarier in a crowded movie theater. Breakthroughs, discoveries, and DIY tips sent every weekday. We've all felt it: heart racing, palms sweating, stomach clenching--the iron grip of fear. Whether it's the sudden threat of an out-of-control vehicle or the nervous wait before a job interview, we all have felt fear's sudden grip.

Why you get goosebumps when you're scared--or inspired The primal reflex still sparks at chills, thrills, and eerie delights. Even the earliest humans got goosebumps. Breakthroughs, discoveries, and DIY tips sent every weekday. As the nights draw in, temperatures drop, and horror movies slink onto our screens, you'll feel the familiar prickle of raised hairs down your arms more often. But why do our bodies get goosebumps in the first place? Goosebumps are valuable tools for many animals.

It's nearly Halloween and what better time of the year than to indulge in some nostalgia by enjoying a Goosebumps book? You remember Goosebumps by R.L. Stine, right? 'Say Cheese and Die'? 'Night of the Living Dummy'? The scary books aimed at young adults were a big hit in the 90s and even inspired a TV show and two movies. Well, now you can relive all those scares and chills with an interactive take on the Goosebumps novels, thanks to the team at Botnik studios.

Artificial intelligence is growing by leaps and bounds, but it won't be replacing humans any time soon, at least if a newly penned-by-AI Christmas jingle is anything to go by. The song starts out like any Christmas jingle, and you may even find yourself tapping your foot along…until the lyrics register and you wonder what kind of dystopian Christmas wonderland you've stumbled upon. The new jingle -- which has been set to music and is sung by a computer itself -- was recently released by the University of Toronto. The work was performed by the university's associate and assistant professors of computer science Raquel Urtasun and Sanja Fidler, as well as graduate student Hang Chu. The team trained the artificial intelligence -- called recurrent neural networks -- to create a "singalong and dance-along" based on a digital image of Christmas-related things.