A Quint of Quads

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In the first part of the video, the destination points are selected ahead of time and collision-free trajectories are pre-computed. All the trajectories are stored before execution. In the second part of the video, however, the next set of destination points is picked at random while the vehicles are still en-route, demonstrating that the algorithm is fast enough to be used in real-time.

I looked into buying one of these kinds of toys a little while ago, but there were numerous warnings about how, no matter how careful you are, you will crash and things will break, so you need to buy a spare parts amounting to a second unit, at least (and I didn’t find it to be a bargain at twice the price).

Pay No Attention to the Eye in the Sky

The Footage the NFL Won’t Show You

Without the expanded frame, fans often have no idea why many plays turn out the way they do, or if the TV analysts are giving them correct information. On a recent Sunday, San Francisco 49ers quarterback Alex Smith threw a deep pass to tight end Delanie Walker for a 26-yard touchdown. Daryl Johnston, the Fox color man working the game, said Smith’s throw was “placed perfectly” and that Tampa Bay Buccaneers safety Corey Lynch was “a little bit late getting there.”

Greg Cosell, producer of the ESPN program “NFL Matchup,” who is one of the few people with access to All-22 footage, said the 49ers had purposely overloaded the right side of the field so each receiver would only be covered by one defender. Lynch, the safety, wasn’t late getting there, Cosell says. He was doing his job and covering somebody else. Johnston could not be reached for comment.

I don’t need All-22 to know that announcers are talking crap. Just hearing them say, “Let’s see if they were drawn offsides” is enough to do that — false start penalties kill the play. If there’s no whistle, there’s no false start, and they should know this. What I suspect is that one would immediately know the slew of “He ran the pattern too short” comments, heard when a player runs an underneath route (e.g. 8 yard pattern on 3rd-and-10) would be shown to be crap as well. The film would likely show that a deeper route would have been covered, and the only way to be open was to run underneath. Sometimes you have to break a tackle or make a man miss.

As for the possibility of more criticism of coaches and players, I don’t care. Rumor has it that they’re adults. Maybe the fans will understand that part of the plan is to fake the other side out and appreciate the nuances of trying to dictate your opponent’s response tactics.

The Devil is in the Details

Breakthrough material is barely more than air

Researchers at HRL Laboratories, the California Institute of Technology, and the University of California at Irvine have created what they say is the lowest-density material, a lattice of hollow tubes of the metal nickel.
Its volume is 99.99 percent air, and its density is 0.9 milligram per cubic centimeter–not including the air in or between its tubes. That density is less than one-thousandth that of water.

Hate the Sin, Love the Sinter

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In this video, researchers at the University of Texas, Austin, guide viewers through the process of laser sintering. This technique, a type of 3-D printing, produces solid objects from polymer and metal powders.

Deep into Stalker Territory

The Social Graph is Neither

Social networks exist to sell you crap. The icky feeling you get when your friend starts to talk to you about Amway, or when you spot someone passing out business cards at a birthday party, is the entire driving force behind a site like Facebook.

We have a name for the kind of person who collects a detailed, permanent dossier on everyone they interact with, with the intent of using it to manipulate others for personal advantage – we call that person a sociopath. And both Google and Facebook have gone deep into stalker territory with their attempts to track our every action. Even if you have faith in their good intentions, you feel misgivings about stepping into the elaborate shrine they’ve built to document your entire online life.

I Feel That Ice is Slowly Melting

Here Comes the Sun

This has already led to rapid growth in solar installations, but even more change may be just around the corner. If the downward trend continues — and if anything it seems to be accelerating — we’re just a few years from the point at which electricity from solar panels becomes cheaper than electricity generated by burning coal.

And if we priced coal-fired power right, taking into account the huge health and other costs it imposes, it’s likely that we would already have passed that tipping point.

But will our political system delay the energy transformation now within reach?

I Knew I Could, I Knew I Could

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This Model of Stephenson’s Steam Engine was made in 2008 by master glassblower Michal Zahradník.

One nit: at about 1:40 it says to notice the steam exhaust — steam is water vapor and is invisible, so you can’t notice it. That’s one reason that steam line ruptures are so dangerous. If you can see it then the water has begun to condense; what you can see are small water droplets.