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For humans, this desire to search is not just about fulfilling our physical needs. Panksepp says that humans can get just as excited about abstract rewards as tangible ones. He says that when we get thrilled about the world of ideas, about making intellectual connections, about divining meaning, it is the seeking circuits that are firing.

The juice that fuels the seeking system is the neurotransmitter dopamine. The dopamine circuits "promote states of eagerness and directed purpose," Panksepp writes. It's a state humans love to be in. So good does it feel that we seek out activities, or substances, that keep this system aroused—cocaine and amphetamines, drugs of stimulation, are particularly effective at stirring it.

Ever find yourself sitting down at the computer just for a second to find out what other movie you saw that actress in, only to look up and realize the search has led to an hour of Googling? Thank dopamine. Our internal sense of time is believed to be controlled by the dopamine system. People with hyperactivity disorder have a shortage of dopamine in their brains, which a recent study suggests may be at the root of the problem. For them even small stretches of time seem to drag. An article by Nicholas Carr in the Atlantic last year, "Is Google Making Us Stupid?" speculates that our constant Internet scrolling is remodeling our brains to make it nearly impossible for us to give sustained attention to a long piece of writing. Like the lab rats, we keep hitting "enter" to get our next fix.

At this point, there's no longer any question in our minds that the iPhone 4's antenna can be made to lose signal by holding it "wrong" -- and we definitely think it's more than a little silly that simply holding the phone in your left hand has been nicknamed the "death grip."

That said, however, it's not at all clear what the real-world effects of the antenna issue actually are for most people -- as we've repeatedly said, several iPhone 4s owned by the Engadget staff (including our review unit) have never experienced so much as a single dropped call, while others suffer from signal issues that results in lost calls and unresponsive data in a dramatic way. What's more, at this point Apple's sold well over two million iPhone 4s, and we simply haven't heard the sort of outcry from users that we'd normally hear if a product this high-profile and this popular had a showstopping defect. Honestly, it's puzzling -- we know that the phone has an antenna-related problem, but we're simply not able to say what that issue actually means for everyday users.

So we're doing what we can do: we've collected reports from every member of the Engadget staff who's using the phone, as well as reached out to a variety of tech industry colleagues for their experiences. As you'll see, most of our peers seem to be doing perfectly fine with their iPhone 4s...

What if gravity is an illusion, a sort of cosmic frill, or a side effect of something else going on at deeper levels of reality?

So says Erik Verlinde, 48, a respected string theorist and professor of physics at the University of Amsterdam, whose contention that gravity is indeed an illusion has caused a continuing ruckus among physicists, or at least among those who profess to understand it. Reversing the logic of 300 years of science, he argued in a recent paper, titled “On the Origin of Gravity and the Laws of Newton,” that gravity is a consequence of the venerable laws of thermodynamics, which describe the behavior of heat and gases.

“For me gravity doesn’t exist,” said Dr. Verlinde, who was recently in the United States to explain himself. Not that he can’t fall down, but Dr. Verlinde is among a number of physicists who say that science has been looking at gravity the wrong way and that there is something more basic, from which gravity “emerges,” the way stock markets emerge from the collective behavior of individual investors or that elasticity emerges from the mechanics of atoms.

Multitaskers:

• Did a significantly worse job filtering out the irrelevant information.
• Took longer than non-multitaskers to switch among tasks.
• Less efficient at juggling problems.
• Tended to search for new information rather than accept a reward for putting older, more valuable information to work.
• Process visual and auditory input less efficiently.
• Become reliant on more a more simplistic, and often inferior, thought process, and can thus fall prey to perceptual decoys.

Maybe multitasking gives the illusion of productivity without achieving higher volume...

I've been watching Babylon 5 lately. It's not a perfect show, but it has one big advantage: it's consistent and believable.

Contrast this with Doctor Who. Doctor Who is fun to watch, but if you think about it for more than two seconds you notice it's full of plot holes and contradictions. Things that cause time travel paradoxes that threaten to destroy the universe one episode go without a hitch the next. And the TARDIS, the sonic screwdriver, and the Doctor's biology gain completely different powers no one's ever alluded to depending on the situation. The aliens are hysterically unlikely, often without motives or believable science, the characters will do any old insane thing when it makes the plot slightly more interesting, and everything has either a self-destruct button or an easily findable secret weakness that it takes no efforts to defend against.

But I guess I'm not complaining. If the show was believable, the Doctor would have gotten killed the first time he decided to take on a massive superadvanced alien invasion force by walking right up to them openly with no weapons and no plan. And then they would have had to cancel the show, and then I would lose my chance to look at the pretty actress who plays Amy Pond.

So Doctor Who is not a complete loss. But then there are some shows that go completely beyond the pale of enjoyability, until they become nothing more than overwritten collections of tropes impossible to watch without groaning.

I think the worst offender here is the History Channel and all their programs on the so-called "World War II".

Let's start with the bad guys. Battalions of stormtroopers dressed in all black, check. Secret police, check. Determination to brutally kill everyone who doesn't look like them, check. Leader with a tiny villain mustache and a tendency to go into apopleptic rage when he doesn't get his way, check. All this from a country that was ordinary, believable, and dare I say it sometimes even sympathetic in previous seasons.

I wouldn't even mind the lack of originality if they weren't so heavy-handed about it. Apparently we're supposed to believe that in the middle of the war the Germans attacked their allies the Russians, starting an unwinnable conflict on two fronts, just to show how sneaky and untrustworthy they could be? And that they diverted all their resources to use in making ever bigger and scarier death camps, even in the middle of a huge war? Real people just aren't that evil. And that's not even counting the part where as soon as the plot requires it, they instantly forget about all the racism nonsense and become best buddies with the definitely non-Aryan Japanese.

Not that the good guys are much better. Their leader, Churchill, appeared in a grand total of one episode before, where he was a bumbling general who suffered an embarrassing defeat to the Ottomans of all people in the Battle of Gallipoli. Now, all of a sudden, he's not only Prime Minister, he's not only a brilliant military commander, he's not only the greatest orator of the twentieth century who can convince the British to keep going against all odds, he's also a natural wit who is able to pull out hilarious one-liners practically on demand. I know he's supposed to be the hero, but it's not realistic unless you keep the guy at least vaguely human.

So it's pretty standard "shining amazing good guys who can do no wrong" versus "evil legions of darkness bent on torture and genocide" stuff, totally ignoring the nuances and realities of politics. The actual strategy of the war is barely any better. Just to give one example, in the Battle of the Bulge, a vastly larger force of Germans surround a small Allied battalion and demand they surrender or be killed. The Allied general sends back a single-word reply: "Nuts!". The Germans attack, and, miraculously, the tiny Allied force holds them off long enough for reinforcements to arrive and turn the tide of battle. Whoever wrote this episode obviously had never been within a thousand miles of an actual military.

Probably the worst part was the ending. The British/German story arc gets boring, so they tie it up quickly, have the villain kill himself (on Walpurgisnacht of all days, not exactly subtle) and then totally switch gears to a battle between the Americans and the Japanese in the Pacific. Pretty much the same dichotomy - the Japanese kill, torture, perform medical experiments on prisoners, and frickin' play football with the heads of murdered children, and the Americans are led by a kindly old man in a wheelchair.

Anyway, they spend the whole season building up how the Japanese home islands are a fortress, and the Japanese will never surrender, and there's no way to take the Japanese home islands because they're invincible...and then they realize they totally can't have the Americans take the Japanese home islands so they have no way to wrap up the season.

So they invent a completely implausible superweapon that they've never mentioned until now. Apparently the Americans got some scientists together to invent it, only we never heard anything about it because it was "classified". In two years, the scientists manage to invent a weapon a thousand times more powerful than anything anyone's ever seen before - drawing from, of course, ancient mystical texts. Then they use the superweapon, blow up several Japanese cities easily, and the Japanese surrender. Convenient, isn't it?

...and then, in the entire rest of the show, over five or six different big wars, they never use the superweapon again. Seriously. They have this whole thing about a war in Vietnam that lasts decades and kills tens of thousands of people, and they never wonder if maybe they should consider using the frickin' unstoppable mystical superweapon that they won the last war with. At this point, you're starting to wonder if any of the show's writers have even watched the episodes the other writers made.

I'm not even going to get into the whole subplot about breaking a secret code (cleverly named "Enigma", because the writers couldn't spend more than two seconds thinking up a name for an enigmatic code), the giant superintelligent computer called Colossus (despite this being years before the transistor was even invented), the Soviet strongman whose name means "Man of Steel" in Russian (seriously, between calling the strongman "Man of Steel" and the Frenchman "de Gaulle", whoever came up with the names for this thing ought to be shot).

So yeah. Stay away from the History Channel. Unlike most of the other networks, they don't even try to make their stuff believable.