With never-before-seen video, primatologist Isabel Behncke Izquierdo (a TED Fellow) shows how bonobo ape society learns from constantly playing -- solo, with friends, even as a prelude to sex.

Indeed, play appears to be the bonobos' key to problem-solving and avoiding conflict. If it works for our close cousins, why not for us?

TED Fellow Isabel Behncke Izquierdo studies the social behavior (and play behavior in particular) of wild bonobos in DR Congo.

TED Fellow Isabel Behncke Izquierdo writes: I was born and raised in Chile, and was educated in animal behaviour and evolutionary anthropology in Cambridge and Oxford.

For my PhD work, I study the social behaviour (and play behaviour in particular) of wild bonobos in DR Congo.

At TEDxDubai, longtime English teacher Patricia Ryan asks a provocative question:

Is the world's focus on English preventing the spread of great ideas in other languages? (For instance: what if Einstein had to pass the TOEFL?)

It's a passionate defense of translating and sharing ideas.

Patricia Ryan has spent the past three-plus decades teaching English in Arabic countries -- where she has seen vast cultural (and linguistic) change.

UK-born language teacher Patricia Ryan has spent most of the past 40 years teaching English in the countries of the Arabian Gulf.

In a zippy demo at TED U, AnnMarie Thomas shows how two different kinds of homemade play dough can be used to demonstrate electrical properties -- by lighting up LEDs, spinning motors, and turning little kids into circuit designers.

AnnMarie Thomas works on the playful side of engineering -- using cool tools to teach and help others.

AnnMarie Thomas joined the faculty of the University of St. Thomas in the fall of 2006.

Previously, she was a faculty member at Art Center College of Design. She is the director of the UST Design laboratory and leads a team of students looking at both the playful side of engineering (squishy circuits for students, the science of circus, toy design) and ways to use engineering design to help others (projects in technology design for older adults).

Activist Caroline Casey tells the story of her extraordinary life, starting with a revelation (no spoilers).

In a talk that challenges perceptions, Casey asks us all to move beyond the limits we may think we have.

First, Caroline Casey put Ireland on the accessibility map. Now she's changing the global social landscape for people with disabilities.

Caroline Casey has dedicated the past decade of her life to changing how global society views people with disabilities.

In 2000, she rode 1,000 kilometers across India on an elephant to raise funds for Sight Savers.

Then, as founding CEO of Kanchi in Dublin, she developed a set of best practices (based on ISO 9000 quality standards) for businesses, to help them see "disabled" workers as an asset as opposed to a liability.

Pioneering surgeon Susan Lim performed the first liver transplant in Asia.

But a moral concern with transplants (where do donor livers come from ...) led her to look further, and to ask: Could we be transplanting cells, not whole organs?

At the INK Conference, she talks through her new research, discovering healing cells in some surprising places.

A surgical pioneer in Singapore, Susan Lim is a researcher and entrepreneur.

Susan Lim established her reputation as a surgeon in 1990 after performing Singapore's (and southeast Asia's) first successful liver transplant.

She has gone on to further pioneer in the field of general surgery, two new surgical technologies for Singapore, the mammotome minimally invasive breast biopsy and robotic surgery for the private sector.