. >> allen greenberg u.s. department of transportation. rick on an earlier point you made about capping all authority and so forth to look at other sectors i believe it's a center for public integrity at nyu is but it was something that suggested that there would be broad authority under two parts of the clean air act and section 115 involving the regulation of international recognized pollutants and 211 for fuel. and the theory is that you can do an economy wide regulatory approach based on the authority from these two sections and i'm wondering whether that's been looked at either by you or coral or john and if you have any comments on it? thank you. >> i'm happy to answer the question. certainly on section 115 there is an ongoing discussion both on the hill and in the environmental community for some time. but that is authority exists. it certainly offers the potential for broad approach. i think that right now it's pretty clear where the administration is having under section 111. i think the amount of energy in the time time that has

today another first he meets bob greenberg, the man behind this site. bob also checks allen'sion. walking a white line on a black matte over a series of tries. what do people see? bob since me and the similar -- simulator. >> this is a half men triangle and circle. >> he keeps exploring. this week at disneyland. seeing mickey mouse, the enchanted castle, and this. >> there. >> technology, wiring our eyes to the world for a chance at second fight. >> wow. look at that. emily: next, what startup could be the biggest threat to mark zuckerberg? we talked to one of facebook's earliest employees, all of that and more after the break. ♪ emily: it is time now for the daily number. today's number is 210, that is the number of employees who quit his that those after a controversial management strategy. the idea involved eliminating management hierarchy so there are no losses. it was created by a former software executive who spelled out in a 30 page constitution for what he calls doing a job, energizing a role. he offered three months severance to employees who did not want to take part