West Nile virus. Words that put public health officials on the alert. A crowd of sleepy bodies basks on a California beach. One of the sunbathers kicks sand onto a smaller male, who grunts and turns over.
Gulls squawk overhead.
Complete invulnerability to hackers and viruses seems problematic, but Security Systems Pty. Ltd. of Perth, Australia, has entered the firewall market with a hardware product it guarantees to be 100 percent impenetrable.