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Cheap, quick and tasty, fast food became a culinary craze in the 1950s. But has our quest for convenience created an irreversible health crisis?

بازیگران مهمان: Don Gorske، بیل کلینتون

Fifteen international agencies spend $62 billion every year on space travel. What's fueling our costly — and dangerous — drive to explore the universe?

بازیگران مهمان: Юрий Гагарин، Alan Shepard، Михаил Горбачёв، George H. W. Bush

In the 21st century, China has become a global economic powerhouse. Why was the rest of the world so slow to notice its rise to the top?

بازیگران مهمان: Mao Zedong، Deng Xiaoping، Hu Jintao، 习近平

Plastics have transformed how we live, but progress comes at a high price: 7.8 billion tons of waste. Are plastics a miracle or a catastrophe?

بازیگران مهمان: Henry Ford

Oil has brought great wealth to the Middle East and ignited major wars. Is it a blessing or a curse for the region, as well as the rest of the world?

بازیگران مهمان: روح‌الله خمینی، Saddam Hussein، محمدرضا پهلوی

We share the planet with an estimated 9 million robots, from self-driving cars to surgical arms. Could they one day completely replace humans?

بازیگران مهمان: آیزاک عظیموف، مارگارت تاچر، Гарри Каспаров

Feminism has ushered in sweeping changes to society, securing rights for women around the world. How much further do we have to go?

بازیگران مهمان: Betty Friedan، John F. Kennedy، Lyndon B. Johnson، Janet Reno

Over 10% of the world's electricity comes from nuclear power. But with radioactive waste and the threat of nuclear meltdown, are we playing with fire?

بازیگران مهمان: William Penney، Harry S. Truman، آدولف هیتلر، آلبرت اینشتین

Nearly 40 million people are living with HIV. After decades of research and activism, how far have we come in finding a cure and battling the stigma?

DNA analysis has given us the tools to map disease, solve crimes and more. But in our rush to decode DNA, are we leaping before we look?

بازیگران مهمان: جورج دبلیو بوش، آنجلینا جولی، برد پیت، Joseph James DeAngelo