i plugged in my guestimates: Prelude&gt; 1.5 * 1 * 0.01 * 0.5 * 0.000001 *0.000001 * 5000 * 1.1<br><br>that's  0.00000000004125, compared to lex's 0.7.<br><br>oh how special we might be.  we might be 1 of just 40 such civilisations in the universe.  ... if we even measure up yet/soon to the communicating ability.