Methods include plastic-coated windows, energy-absorbing materials and tying down heavy objects and ceiling panels.

BBC: Newcastle engineers research bomb-proof train carriages

The system has a guaranteed lifespan of 50 years and is endlessly sustainable--the underground temperature is determined mainly by the earth-absorbing solar energy.

FORBES: Fort Knox's Buried Treasure

They then have nowhere to put all the light energy they are absorbing, and the resulting breakdown of biochemical pathways creates toxic oxygen-containing molecules known as free radicals.

ECONOMIST: Life��s a bleach, and then you die