Is it time to worry about human cloning again?

People are copying pets to preserve a physical - and spiritual - connection to dead children. MIT Technology Review reports.

When Barbra Streisand revealed to Variety magazine that she'd had her dog cloned for $50,000, many people learned for the first time that copying pets and other animals is a real business.

That's right: you can pay to clone a dog, a horse or a top beef bull and get a living copy back in a matter of months.