How to save a life.

Some 90 people have been pulled from the rubble by the 52 rescue teams from around the world, and untold numbers of others by Haitians digging through collapsed buildings.

Racing against time, they hoped for a repeat miracle like that of an elderly woman pulled out on Tuesday from the rubble around the National Cathedral.

"I felt her grab my hand and squeeze. I felt as if God were squeezing my hand," said an emotional Javier Vazquez, the rescue crew member from Mexico who reached her.