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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?

Which of your sick remedies are actually helping?

It's the season for sneezin'!

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.