Just because three Michigan brothers haven't been found alive yet doesn't mean hope is lost, the president of the National Center for Missing and Exploited Children said today. Ernie Allen, president of the organisation based in Alexandria, Virginia, said the children still can be found. "What we know is that time is the enemy,'' Allen said. "The good news in this case is that response was swift.'' Allen said most of the 800,000 children reported missing each year in the US are recovered safely - even in abduction cases, where 60 percent of children are found alive. But if children...