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An adult human can distinguish up to 10,000 odors. You use your nose to figure out what to eat, what to buy and even when it's time to take a shower. But how do the molecules in the air get translated into smells in your brain? Rose Eveleth charts the smelly journey through your olfactory epithelium and explains why scent can be so subjective.

Sam Harris, an American neuroscientist, author, and philosopher, shares his concept of the present moment and why it matters to live in the now rather than wait for the "now" of the future. Remember to live for each and every moment.

Could technology be used to control your brain?

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.