The Reconstruction Finance Corporation (RFC) was established during the Hoover administration with the primary objective of providing liquidity to, and restoring confidence in the banking system. The banking system experienced extensive pressure during the economic contraction of 1929-1933.
Typical materials used for electromagnetic shielding include sheet metal, metal screen, and metal foam. Any holes in the shield or mesh must be significantly smaller than the wavelength of the radiation that is being kept out, or the enclosure will not effectively approximate an unbroken conducting surface.
Because of this, we are well protected from the electromagnetic radiation of space weather. The Earth's main protection against energetic particles, which can be just as harmful as electromagnetic radiation, is its magnetic field and the protective effects it creates. The Earth's magnetic field creates a shield which deflects ionised particles so that they cannot reach the Earth's surface.