stephanie dhue, "nightly business report," washington. >> tom: finally, feeling a little cranky today? if you were, you're not alone. scientists at harvard and northeastern universities looked at more than 300 million posts on twitter and found people are at their angriest on thursdays. that bad mood peaks in the middle of the day from about noon to 3 p.m. the study searched for words linked to certain moods and tracked how frequently they were used on twitter. the study found folks are at their happiest on sunday mornings. >> we're angry on thursday because it's not friday, we're happy on sunday, because it's not monday. >> i not coo put a fing or t. i was wondering what it was today around 3 tx*nd00 when i was getting crank ef. >> that' . >> susie: that's "nightly business report" for thursday, july 22. >> tom: i'm tom hudson, good- night everyone and good-night to you too susie. >> susie: good-night tom. i'm susie gharib. goodnight everyone. "nightly business report" is made possible by: captioning sponsored by wpbt captioned by media access group at wgbh access.wgbh.org >> more in

stephanie dhue talked with feinberg this morning and asked him about that decision. >> they were too big, some individuals were getting in excess of $10 million in bonus payments over a five-year period, there were severance payments where individuals, companies, after they received tarp, we're paying people walking out the door, no longer working at the company, there were gross-ups, where in order to cover tax payments, there would be additional money, allocated to these individuals, we concluded after months of review, these companies should not have done what they did. >> reporter: six banks that made what feinberg calls "ill- advised" payments still owe taxpayers. they are citibank, c.i.t. group, which has since gone through bankruptcy, suntrust, regions financial, m&t bancorp and a.i.g. 11 repaid tarp, including j.p. morgan chase, bank of america and goldman sachs. none of the banks rescinded those payments. feinberg says he didn't think he had the authority to demand the money back. >> at the time these payments were made, as ill-advised as they may have been, they were not in

and, as stephanie dhue reports, it may take more than a change at the top to fix b.p.'s problems. >> reporter: tony hayward had more than his share of blunders >> i had no problem with drilling of this well. i think it's too early to reach conclusions. i don't know. i simply was not involved in the decision making process. >> reporter: but the jury is still out on how much switching c.e.o.s will change things. hayward was brought in three years ago to address safety concerns after a major oil spill in alaska and a deadly explosion at b.p.'s texas refinery. but then, as now, experts say b.p. has to change more than its c.e.o. industry observer lou pularesi says that kind of change takes time. >> to develop a culture of safety takes a real commitment, and it's not just money, it's having the technical competence, looking at all your operations, having everyone with confidence that they can shut down the rig and change the procedure. >> reporter: hayward's likely replacement, american robert dudley, has 32 years in the oil business. he joined british petroleum when the com