The documentary from the series "Seven Continents, One Planet" explores how wild animals must adapt to extreme cold, while the American lynx uses its cunning to capture its favorite prey, the snow hare, which is more agile and swift. Then, the warm forests of Mississippi, where you can witness the mesmerizing spectacle of millions of fireflies glowing in the night. Traveling far and wide across North America, you discover just how vast the territories are still untouched by concrete. The episode continues with an investigation into a broad-spectrum antiviral being developed in Lausanne, narrated by Barbara Gallavotti and Francesca Marcelli. Next, Paolo Magliocco and Daniela Franco explore the challenge of the Polytechnic University of Milan's laboratory in a cement plant in northern Italy to eliminate the CO2 produced by the industry before it reaches the atmosphere. What are the possibilities and limitations of smart working today?