but the company performs this test, 250,000 times a year. so it's frequently done. >> all right. certainly a crucial question. probably a lot of people didn't think about. when you do and think about your health, it's a big one. thank you so much to poppy harlow. and this weekend dr. sanjay gupta is going to take a look at genetic testing. still to come, "outfront," soccer star david beckham makes a surprise announcement. you know what? we have an interesting take on this. it's not about david. it's about victoria. plus, a mathor revelation of the boston bombing case. police find a note in the boat where dzhokhar tsarnaev was hiding and he managed to write as he was lying there injured. and at least six people killed when tornadoes touched down in texas overnight.