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In an unflinching look at issues that widen the political divide in the US, journalist and editor Bari Weiss highlights why courage is the most important virtue in today's polarized world. She shares examples of people who have spoken up in the face of conformity and silence — and calls on all of us to say what we believe. (Followed by a Q&A with head of TED Chris Anderson)

Are you "too nice" at work? Social psychologist Tessa West shares her research on how people attempt to mask anxiety with overly polite feedback — a practice that's more harmful than helpful — and gives three tips to swap generic, unhelpful observations with clear, consistent feedback, even when you feel awkward.

We tend to celebrate leaders for their dramatic words and actions in times of crisis — but we often overlook truly great leaders who avoid the crisis to begin with. Historian Martin Gutmann challenges us to rethink what effective leadership actually looks like, drawing on lessons from the famed (but disaster-prone) explorer Ernest Shackleton.

What if you could code just by talking out loud? GitHub CEO Thomas Dohmke shows how, thanks to AI, the barrier to entry to coding is rapidly disappearing — and creating software is becoming as simple (and joyful) as building LEGO. In a mind-blowing live demo, he introduces Copilot Workspace: an AI assistant that helps you create code when you speak to it, in any language.

Whether or not you believe the world is doomed might depend on where you get your news, says journalist Angus Hervey. He delivers stories of progress that mainstream media organizations missed last year — from advances in clean energy to declining rates of extreme poverty, crime and disease — and suggests we should pay more attention to such occurrences. "If we want more people to devote themselves to the task of making progress, then maybe we should be telling more people that it's possible to make progress," says Hervey.

Democracy may be an abstract concept, but it holds the very essence of our autonomy and humanity, says lawyer and human rights advocate Fatma Karume. Sharing her journey navigating a tumultuous political transition in Tanzania that put her life at risk, she highlights the importance of speaking truth to power and fighting for a brighter democratic future.

There are more than 2,000 firefly species, found on every continent except for Antarctica — an astonishing diversity of movement and light. Firefly scientist Wan Faridah Akmal Jusoh explores the mysteries of these little beetles that light up the night and details her quest to discover and protect new species as their habitats are at risk of disappearing.

What you experience through your senses — sight, smell, hearing, taste and touch — can impact how healthy you are and how long you live, says neurobiologist Christi Gendron. She explores how environmental cues like temperature, light and even just the sight of death have influenced the lifespan of fruit flies, suggesting your everyday perceptions may have direct repercussions on your ability to live a long, healthy life.

In the beginning of the universe, all was darkness — until the first organisms developed sight, which ushered in an explosion of life, learning and progress. AI pioneer Fei-Fei Li says a similar moment is about to happen for computers and robots. She shows how machines are gaining "spatial intelligence" — the ability to process visual data, make predictions and act upon those predictions — and shares how this could enable AI to interact with humans in the real world.

When the world's problems have you weary, journalist and editor Annalee Newitz suggests a good dose of escapist fiction to refresh your perspective. Step into the whimsical world of science fiction, cosplay and "goblincore" to see how fantasy worlds help us reimagine our relationships with our communities and each other — and why the best way to solve your problems may start with escaping them.