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Johan Rockström’s theory of climate boundaries has proven so influential it’s been adopted by the Vatican. Writer John Carey digs into the theory — and why Rockström says his isn’t, actually, a doomsday message.

After examining dozens of Ice Age cave sites across Europe, paleo-archaeologist Genevieve von Petzinger found our ancestors used a small group of signs in common. Here, she walks us through her eye-opening discoveries and their implications.

We need to have more honest, open-ended conversations about race and bias — in our own lives and in the TV shows and movies we see, says diversity consultant Vernā Myers.

Secrecy is often used as a legal shield to cover up illegal actions by businesses. Anti-corruption activist and TED Prize winner Charmian Gooch explains why we should care — and what we should do.

Gaslighting leaves you confused, off-balance, and on the defensive. Dr. Robin Stern helps explain the core signs of being targeted.

40+ TED speakers recommend the books you need to read right now.

A public service announcement from TED, with help from artist Wendy MacNaughton.

Can architecture actually make a difference in the lives of the people who use it? Michael Murphy and his team at MASS Design Group believe so. Take a look at their designs.

Catharine Young describes a visit to Liberia, where Ebola may be contained but the public health story has only just begun.

Phil Hansen ended up using an amazing 52,901 dots to draw this portrait in a process that was anything but child’s play. On the way to setting a Guinness World Record, he had to solve many puzzles — and wrestle with some demons.