By 2100, the UN estimates that the world's population will grow to just over 11 billion people. Architect Vishaan Chakrabarti wants us to start thinking about how we'll house all these people -- and how new construction can fight climate change rather than make it worse. In this visionary talk, Chakrabarti proposes a "Goldilocks" solution to sustainable housing that exists in the sweet spot between single-family homes and towering skyscrapers.

What if we treated the risk of pandemics the same way we treat the risk of fires? In this eye-opening talk, infectious disease epidemiologist Jennifer B. Nuzzo unpacks how the Great Baltimore Fire of 1904 sparked a cultural shift in how we defend against fires -- and explains why pandemics demand the same sort of reaction. She breaks down the data we need to gather when facing possible danger, the drills we need to ready ourselves and the defenses that could keep future threats at bay -- so next time, we're prepared.

Whether you have one follower or a million, we've all witnessed nastiness and hate speech on social media. YouTube content creator and mental well-being motivator Peachy Liv advocates for a kinder, more respectful digital world -- and urges us all to reflect before we share our thoughts online. Hear her tips for dealing with cyberbullying and personal insights on how we can all make the internet a safer place.

"This chair is my legs -- this chair is my life," says accessibility champion Jane Velkovski, who uses a wheelchair after being diagnosed with Spinal Muscular Atrophy (SMA). With clarity and poise, he shares how his first motorized wheelchair empowered him with independence and ability -- and why assistive technology should be available to anyone who needs it. "Freedom of movement, no matter on legs or on wheels, is a human right," he says.

"I want all families to be made whole, to be reunified, to be together -- as is our right," says writer, poet and student Elizabeth Zion. In this profoundly moving talk, Zion shares the impacts of family separation, including her personal struggles with homelessness and poverty -- and points a way toward moral and just policies that recognize the human rights of migrant families.

The climate crisis has been largely caused by irresponsible adults in developed countries, but it's the children of developing nations -- like Zimbabwean environmental activist Nkosilathi Nyathi -- that suffer from the most disastrous consequences. In a world where climate catastrophe feels almost unstoppable, we must involve everyone in finding solutions -- especially young people, who have the most at stake. "My generation has more to offer than ever before," Nyathi says. "We live climate change in a way our parents' generation did not."

For children growing up in refugee camps, education is a powerful tool of liberation. In this inspiring talk, Makhtoum Abdalla, displaced as a child in Sudan and now living with his family in the Otash camp in Darfur, shares his biggest dream: to ensure all children are educated and taught the skills needed to become "captains of their destiny."

Less than seven percent of people worldwide have a bachelor's degree -- and for many, this is simply because the cost of university is too high, says higher education executive Adrian K. Haugabrook. In this barrier-breaking talk, he introduces an innovative approach to expanding access to higher education by driving down costs and rethinking three key things: time, place and how we learn.

Memory foam, air purifiers, scratch-resistant lenses: these are just a few of the everyday items originally developed for space missions. Aerospace engineer Eric Hinterman invites us to dream big and imagine what technological advancements could come next, explaining why establishing a human presence on Mars is a big step for life on Earth -- and a giant leap toward becoming a space-faring species.

Did you know that not getting enough sleep can actually make you hungrier? According to sleep scientist Matt Walker, the relationship between what you eat and your sleep is a two-way street. Here's why understanding it can help improve your overall health.