The deepest clean lab in the world

摘要

The great depth and cleanliness of SNOLAB allows the study of extremely rare interactions and weak processes.Deep in a mine in Greater Sudbury, Ontario, Canada, you willfind the deepest flush toilets in the world. Four of them, actually,ensuring the comfort of the staff and users of SNOLAB, an underground clean lab with very low levels of background radiation thatspecialises in neutrino and dark-matter physics.