What a year! These 14 talks challenged our perceptions of love, happiness, what the future will hold ... and, um, the very nature of reality itself.

Writer and designer Graham Hill asks: Can having less stuff, in less room, lead to more happiness? He makes the case for taking up less space, and lays out three rules for editing your life.

Researcher Matt Killingsworth designs studies that gather data on happiness. One takeaway? "A Wandering Mind Is an Unhappy Mind."

Cognitive researcher Nancy Etcoff looks at happiness -- the ways we try to achieve and increase it, the way it's untethered to our real circumstances, and its surprising effect on our bodies.

Can happiness be bought? To find out, author Benjamin Wallace sampled the world's most expensive products, including a bottle of 1947 Chateau Cheval Blanc, 8 ounces of Kobe beef and the fabled (notorious) Kopi Luwak coffee. His critique may surprise you.

Using simple, delightful illustrations, designer Stefan Sagmeister shares his latest thinking on happiness -- both the conscious and unconscious kind. His seven rules for life and design happiness can (with some customizations) apply to everyone seeking more joy.

We are so preoccupied with happiness that the Declaration of Independence guarantees our right to pursue it. But are we doing it right? Historian Caroline Winterer argues that what the founding fathers meant was public happiness, the need for citizens to work collectively toward a robust democracy. "Only public happiness," she explains, "creates...

Graphic designer Stefan Sagmeister takes the audience on a whimsical journey through moments of his life that made him happy -- and notes how many of these moments have to do with good design.

What is happiness, and how can we all get some? Biochemist turned Buddhist monk Matthieu Ricard says we can train our minds in habits of well-being, to generate a true sense of serenity and fulfillment.

At TEDxCambridge, Michael Norton shares fascinating research on how money can indeed buy happiness -- when you don't spend it on yourself. Listen for surprising data on the many ways pro-social spending can benefit you, your work, and (of course) other people.

"Tipping Point" author Malcolm Gladwell gets inside the food industry's pursuit of the perfect spaghetti sauce -- and makes a larger argument about the nature of choice and happiness.

Eve Ensler, creator of "The Vagina Monologues," shares how a discussion about menopause with her friends led to talking about all sorts of sexual acts onstage, waging a global campaign to end violence toward women and finding her own happiness.

We all strive for happiness -- but we spend most of our lives learning to be unhappy, says Srikumar Rao. In this practical talk, he teaches how to break free of the "I'd be happy if ..." mental model, and embrace our hard-wired happiness.

From work and happiness, to love and success (and everything else in between), these talks offer insights on some of life's biggest secrets.

Mihaly Csikszentmihalyi asks, "What makes a life worth living?" Noting that money cannot make us happy, he looks to those who find pleasure and lasting satisfaction in activities that bring about a state of "flow."

Dan Gilbert, author of "Stumbling on Happiness," challenges the idea that we'll be miserable if we don't get what we want. Our "psychological immune system" lets us feel truly happy even when things don't go as planned.

Shawn Achor is the CEO of Good Think Inc., where he researches and teaches about positive psychology.

The first American to be ordained a Tibetan Monk by the Dalai Lama, Robert A.F. Thurman is a scholar, author and tireless proponent of peace.

In his book In Praise of Slowness, Carl Honoré dissects our speed-obsessed society and celebrates those who have gotten in touch with their "inner tortoise."

Chip Conley disrupted the hospitality industry -- twice.

Jessi Arrington is a color-loving designer based in Brooklyn.

Executive, educator, writer and life coach Srikumar S. Rao asks, "Are you ready to succeed?" -- and in his famous course "Creativity and Personal Mastery," he teaches his students how to do so.

City planners are already busy designing futures full of bike paths and LEED-certified buildings. But are they designing for our happiness? It's hard to define, and even harder to plan for, but urban planner Thomas Madrecki has a simple solution: Ask the public.

Nic Marks gathers evidence about what makes us happy, and uses it to promote policy that puts the well-being of people and the planet first. He's the founder of the Centre for Well-Being at the UK think tank New Economics Foundation (NEF).

Typically financial parameters like return on equity, cash flow or relative market share indicate to investors if a company is fundamentally healthy, but millennial Lena Bieber wants a new measure of a company's long-term prospects. What if companies instead used happiness as an additional indicator of success? By measuring such factors as aver...

What does happiness sound like? What about misery? Musician Mira Calix explores the emotional qualities embedded in music and noise and shares a sound-based spectrum of human sentiments that emerged from her work.

Our culture is obsessed with happiness, but what if there's a more fulfilling path? Happiness comes and goes, says writer Emily Esfahani Smith, but having meaning in life -- serving something beyond yourself and developing the best within you -- gives you something to hold onto. Learn more about the difference between being happy and having mean...

A fun, uplifting challenge: For the next 10 days, watch one TED Talk from this list to shift yourself into a life of positive thinking.

In her book "The Power of Meaning," Emily Esfahani Smith rounds up the latest research -- and the stories of fascinating people she interviewed -- to argue that the search for meaning is far more fulfilling than the pursuit of personal happiness.

Neil Pasricha is the New York Times bestselling author of The Happiness Equation and serves as the Director of the Institute for Global Happiness after a decade running leadership development inside Walmart. He is one the world's leading authorities on happiness and positivity.