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We spend an inordinate amount of time thinking about, and in various ways 'styling' our hair. It's not entirely silly; we're trying to tell the world - through the language of keratin strands - about who we are.

We've heard it. We get it. We know! Drink more water! But it's not just overplayed advice from fitness magazines and your mother. When we get dehydrated our bodies send out clear warning signs that we need to check our fluid levels. If that happens, it's important to do everything to get your hydration level back on track. Here are some of the symptoms associated with not drinking enough water...

Lissa Rankin, MD is an OB/GYN physician, author, keynote speaker, consultant to health care visionaries, professional artist, and founder of the women's health and wellness community OwningPink.com. Discouraged by the broken, patriarchal health care system, she left her medical practice in 2007 only to realize that you can quit your job, but you can't quit your calling. This epiphany launched her on a journey of discovery that led her to become a leader in the field of mind/body medicine, which she blogs about at OwningPink.com and is writing about in her third book Mind Over Medicine: Scientific Proof You Can Heal Yourself (Hay House, 2013).

Micro ASMR: Defrost | Macro Video of Thawing Fruits & Vegetables

Obesity is an escalating global epidemic. It substantially raises the probability of diseases like diabetes, heart disease, stroke, high blood pressure, and cancer.

It starts with a tickle in your throat that becomes a cough. Your muscles begin to ache, you grow irritable, and you lose your appetite. It's official: you've got the flu. It's logical to assume that this miserable medley of symptoms is the result of the infection coursing through your body - but is that really the case? Marco A. Sotomayor explains what's actually making you feel sick.

The placebo effect is an unexplained phenomenon wherein drugs, treatments, and therapies that aren't supposed to have an effect - and are often fake - miraculously make people feel better. What's going on? Emma Bryce dives into the mystery of placebos' bizarre benefits.

Special thanks to Laser Away in Santa Monica for helping make this happen - your staff was awesome!

Sitting down for brief periods can help us recover from stress or recuperate from exercise. But nowadays, our lifestyles make us sit much more than we move around. Are our bodies built for such a sedentary existence?

Is sitting too much killing you?

How exactly does meditation affect your body?

It's the season for sneezin'!

Which of your sick remedies are actually helping?

A weekly show where knowledge junkies get their fix of trivia-tastic information. This week, John looks at some of the ways technology has improved our lives.

Tired of searching for the perfect diet or pill to shed some pounds? Find out the top weight loss tips, with solid science to back them up.

Our skin is the largest organ in our bodies, with a surface area of about 20 square feet in adults. When we are cut or wounded, our skin begins to repair itself through a complex, well-coordinated process. Sarthak Sinha takes us past the epidermis and into the dermis to investigate this regenerative response.

Why do we feel so tired all the time? Hannah Fry looks at the reasons modern life might be exhausting us, from irregular bedtimes to blue lights from our phones.

Dan Harris explains the neuroscience behind meditation, but reminds us that the ancient practice isn't magic and likely won't send one floating into the cosmic ooze. He predicts that the exercise will soon become regularly scheduled maintenance, as commonplace as brushing your teeth or eating your veggies. Harris, an ABC News correspondent, was turned on to mediation after a live, on-air panic attack. His latest book is 10% Happier: How I Tamed the Voice in My Head, Reduced Stress Without Losing My Edge, and Found Self-Help That Actually Works--A

If you get too little, or too much, your brain could suffer.

Andrew was diagnosed with Early Onset Parkinson's Disease in 2009 when he was 35 years old. He lives with his wife and two children in Auckland, New Zealand. In November 2012 and February 2013 he underwent a surgical procedure, Deep Brain Stimulation surgery, to help control his motor symptoms.