apparently there was too much slack in the rope he was using that sent him crashing into the base of the arch. it's called pendulum swinging. and one video on youtube racked up more than 17 million views. >> oh, boy. senator tim johnson is expected to announce today he will not run again when his term ends. the south dakota democrat suffered a brain hemorrhage in 2006, but later returned to the senate and won re-election in 2008. he has recovered significantly. although sometimes he uses a motorized scooter. johnson becomes the fifth democratic senator to decide against another term. do you remember what you were doing at 17 years old? a teenager from london sold an app to yahoo! for a reported $30 million. i think i was cutting lawns. >> wasn't doing that. >> yeah, nick began working on the app at home when he was 15. he's now 17. which makes him younger than yahoo! which was incorporated back in 1995. the app makes it easier to read news stories on the smaller screens for smartphones. 30 million bucks!