"At three of these locations our investigations concluded that the noise should be mitigated through the installation of low noise surfacing materials when the existing surface is worn out, in accordance with our maintenance policy, " said an agency spokesperson.

BBC: Gloucester estate residents complain about M5 noise

Tests carried out in 2004 on the boards of this room dating back to the 1830s revealed the original surface beneath grime, discolored varnish and the repainting done by maintenance staff over fifty years ago.

FORBES: The Work of Undoing the Past

It is extremely rare on earth as it is created during very active nuclear reactions, most commonly found on the surface of the sun, but here can only be found as a by-product of the maintenance of nuclear weapons.

CNN: Mining the moon for a nuclear future