2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/27465Using 20 months of CPU time on our special purpose computer ``Percola'' we determined the exponent for the normal conductivity at the threshold of three-dimensional site and bond percolation. The extrapolation analysis taking into account the first correction to scaling gives a value of $t/ν= 2.26\pm 0.04$ and a correction exponent $ω$ around 1.4.Condensed Mattertext