"Last Friday, a crude seaweed-and-shell abacus washed up on the beach near Hilo, Hawaii. The next day, a far more sophisticated abacus, fashioned from some unknown material and capable of calculating equations involving numbers of up to 16 digits, washed up on the same beach. The day after that, the beach was littered with thousands of what turned out to be coral-silicate and kelp-based biomicrocircuitry."