Story : In the second episode, we will go with the Ushuaia crew to the Sahara, following a nomadic tribe that has adapted well to the extreme conditions of the desert. It will be above all an opportunity to understand how this part of the world has changed over the course of a few millennia. In fact, where today there is only sand, rocks and arid landscapes, there were once lakes, savannahs and large animals. New interesting studies on plants and their “behavior” through extraordinary high-speed filming, made at the plant neurobiology center in Florence. In the report by Barbara Bernardini and Marco Visalberghi. The new headquarters of the Exploratorium, one of the most famous science museums in the world, has just been inaugurated in San Francisco. Lorenzo Pinna and the Superquark crew visited the new installations, thus creating an opportunity to remember the history of this extraordinary museum.