Water is an essential element for the planet and its flora and fauna, including humanity. But what do we know about water? The exhibition (Eau, L’expo) is divided into three themes: water and life, water and people and water and society. Besides, a separate section focuses on water in the Jura and Switzerland. The exhibition presents water from its cosmic origins, its development on earth, its omnipresence and its many appearances, its indispensable role in the evolution of life and the need of sustainable maintenance of this source of life.