in washington, i'm nicole collins. >>> the field of official republican presidential contenders just got a bit more crowded today. >> i'm ready to lead. i'm ready! [ applause and cheers ] >> in front of a hometown crowd, former two-term pennsylvania senator rick santorum made his white house run today official. santorum is considered a favorite among social conservatives. >>> it's being hailed as a breakthrough, a breast cancer drug that treats the disease may also prevent it. dr. kim explains. >>> mentally prepared for it physically prepared for it. you're not. >> families flee a massive wildfire in arizona. how close crews are to containing the flames tonight. >>> from the cbs 5 weather center, the end is near! it's true! the end to the drizzle, the cloudy skies, we'll have your pinpoint forecast as eyewitness news continues on the cbs 5. ,, ,,,,,,,,,,,, low humidity and strong winds he >>> the weather is making it harder for firefighters to fight a wildfire in arizona. low humidity and winds helped it grow to more than 300 square miles today. mountain communities along eastern ari

in washington, i'm nicole collins. >> the health implications may be unclear but any proof of a cancerve obvious imply kag cases for the industry. earlier, maggie reardon said that the development should not derail progress in the nobmobil sector. >> i think the industry stays pretty focused on the message that they've been giving out that cell phones don't possess any risk. people have to look at the safety standards and looking at where those come from. >> with so many differing sources in this debate it can be pretty difficult to keep up with exactly what the current way of thinking is, nina. >> certainly is quite difficult to keep up with, isn't it, andrew? it is a story we'll be following closely on cnn and "world business today." >>> up next, the boss. hong kong's ceo telling us about the journey to the top. don't go away. >>> from cnn hong kong, i'm andrew stevens. >> and i'm nina december santos at cnn london. welcome back to "world business today." let's see european stock markets. it seems as though they're firmly stuck in the red. at the moment, but just two teeter towards t

our reporter nicole collins standing by live in washington d.c. taking a look at endeavour's 19 year history and what is in its future. nicole. >> reporter: good morning, dave. thousands of people came out to kennedy space center early this morning in florida to welcome home the crew of shuttle endeavour for the final time. the shuttle landed around 2:30 a.m. eastern time. endeavour traveled to the international space station was linked there for eleven days installing a $2 billion machine that is already at work gathering information for nasa. endeavour spent 16 days in space during this trip, but over the course of its 19 years in service the shuttle spent a total of 299 days in space and traveled nearly 123 million miles. endeavour also orbited the earth more than 4500 times. now endeavour is the youngest shuttle in the space program and it could likely perform more space travel but as nasa's 30 year shuttle program comes to an end, so does the life span of endeavour. this is its 25th mission to space was its last. talking about some of what the

nicole collins is in our washington d.c.ing with what the youngest shuttle in the fleet accomplished before being retired. >> reporter: good morning, pam. thousands of people turned out last night at kennedy space center in florida to watch shuttle endeavour come home from space for the last time. the shuttle landed around 2:30 a.m. eastern time. endeavour spent 16 days in space during this trip, but over the course of its 19 years in service the shuttle spent a total of 299 days in space and traveled nearly 123 million miles. endeavour also orbited the earth more than 4500 times. endeavour the youngest shuttle in the space program could likely perform more space travel, but as nasa's 30-year- old shuttle program comes to an end, so does the life span of endeavour. this its 25th mission to space with this last endeavour travel to the international space station was linked there for eleven days installing a $2 billion machine already at work gathering information for nasa. here's endeavour commander mark kelly. >> mission wen