It's invisible, vital and life-sustaining. Get to know air, our ubiquitous and ever-present (if not a little gassy) neighbor.

You’ve heard of ‘do it yourself,’ but what about ‘grow it yourself?’ Enjoy these quirky talks full of possibilities.

Got just enough time for a coffee, but in need of a mental pick-me-up? These short, yet riveting talks may just do the trick.

These talks pull interesting ideas out of shocking crimes.

Bring plants inside, outside and to your community with these talks all about the power of gardening and nourishing the nature around us.

A delightfully useful collection of explanations, how-tos and amusing trivia.

Humans are builders and creators—but how can we build thoughtfully, without waste? These talks explore sustainable design—both past and present—and its beautiful, inspiring results.

Sometimes it’s easy to think the worst of human beings. But these inspiring talks can help you remember: altruism, kindness and helping hands are all around.

Life is long, and so is this list. A treasure trove of how-tos (from tying your shoes to finding work you love) to bookmark, download and return to again and again.

Beyond our galaxy, there lies much more to be discovered. Learn how we explore the universe with talks that are definitely out of this world.

What. A. Year. These 25 TED Talks helped us make better decisions, taught us some fascinating science, gave us some hope for humanity and showed us what it's like to climb 3,000 feet ... without a rope.