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The Walking Dead returned with a bang for its eighth season Sunday night  as Alexandria  the Hilltop and the Kingdom escalated the conflict with Negan and the Saviors to all-out war. Before leading the attack on the Sanctuary   Rick  delivered one of  his  classic impassioned speeches about the meaning of the group's mission.
"We found each other and that bigger world is ours by right "  he  said. "And if we've come together  all of us  it's that much more true. It's ours by right. Any person who would live in peace and fairness  who would find common ground  they're right too. But those who use and take and kill to carve out the world and make it theirs alone  we end them. We don't celebrate it. We don't have shame about it either. There's only one person who has to die and I will kill him  myself . I will."
However  there were also a series of cryptic flash-forwards interspersed with the present-day battle scenes that featured a much older  Rick  waking up in  his  home with Michonne  Carl and Judith followed by a wildly distressed  Rick  alone in an unclear location. "My mercy prevails over my wrath " the tearful  Rick  whispers near the end of the episode.
The old-man Rick sequence was teased in the trailer for the season that premiered at San Diego Comic-Con and led fans to speculate that the show intended to mirror the time-jump that takes place in the Walking Dead comic books following the war with Negan. But judging by the setup of the premiere  it seems more likely that it is only Rick's vision of what could have been if he and his family had been able to live in peace.
The Walking Dead Season 8 Recap: Who Is Old Man Rick ?

Stocks are overpriced  but that may not be a problem   Peter Costa   president of Empire Executions  told CNBC on Tuesday.
"There's a confluence of really good things. There's good earnings  [and] low interest rates  even with the rate hike next week or next month or whenever it is. You've got a really good environment for stocks  " Costa  said on CNBC's "Closing Bell."
This environment also means that stocks are "absolutely" overpriced   Costa  said.
Still   Costa  said  "I don't know if overpriced is an issue anymore."
Stocks are overpriced but it doesn't matter: Empire Executions' Peter Costa

After enduring one too many maddeningly slow boarding experiences  Jason Steffen a professor of physics and astronomy at the University of Nevada Las Vegas  began digging into the unexpectedly complicated mechanics of efficiently ushering passengers onto planes.
In 2008   Steffen  created a computer simulation to evaluate existing boarding methods and ultimately design what  he  claims is the most efficient option for getting restless passengers into their seats. The results were published several years ago in the Journal of Air Transport Management (summarized here).
In  his  research   Steffen  identified the two most common factors responsible for slowing the boarding process to a painful crawl:
In fact  the most routine boarding process â from back to front â is actually the slowest of them all   Steffen âs argues  Itâs even less efficient than boarding a plane in a completely random order.
 Steffen  claims that  his  proposed method  which minimizes the former issue and eliminates the latter  could significantly reduce boarding times  thus cutting down on overall door-to-door flight lengths  and ultimately saving airlines hundreds of millions of dollars a year.

Looking for the Fastest Way to Board a Plane? Better Ask An Astrophysicist