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Many athletes are competing in hopes of qualifying for the Olympic Trials in Indianapolis

World record holder Summer McIntosh is top seed in the 400 IM and aims to double up on event wins and meet records after winning the 400 free yesterday.

Ever wondered why we count magpies or whether or not postcodes have an impact on house prices? Or why hayfever is only going to get worse?

Its seat. day one, big pressure. fans think he pulled it off. >> scrim any was unbelievable. >> he did amazing. it was absolutely amazing. >> it was out of control in there. >> reporter: as for fallon, he knows he's filling big should yous from allen to parr, carson to leno. decades of success now rest on his shoulders. >> if you let me stick around long enough, maybe i'll get the hang of it. >> reporter: tracie potts, nbc news, new york. >> got to tell you, a lot of excitement in this building because of florida. and because of this, too. it is day 11 of the olympic winter games in sochi with...

Knows he won't be in this job forever and there was always a little tension between jay leno and conan o'brien that really doesn't exist between him and jimmy fallon so i think that helps as well. there is better relationships there all around. >> according to the hollywood reporter, fallon called leno to smooth things over and ease the transition of coasts and hosts. now, of course there is this bigger question coming up, though, with the thought the show could move back to new york. is los angeles now losing its grip on the entertainment industry? film and tv production is increasingly movin...