[Editor's note: This story has been updated. See end of article]

An online ad company called Turn is using tracking cookies that come back to life after Verizon users have deleted them. Turn's services are used by everyone from Google to Facebook.

An online advertising clearinghouse relied on by Google, Yahoo and Facebook is using controversial cookies that come back from the dead to track the web surfing of Verizon customers.

The company, called Turn, is taking advantage of a hidden undeletable number that Verizon uses to monitor customers' habits on their smartphones and tablets. Turn uses the Verizon number to respawn tracking cookies that users have deleted.


"We are trying to use the most persistent identifier that we can in order to do what we do," Max Ochoa, Turn's chief privacy officer, told ProPublica.

Turn's zombie cookie comes amid a controversy about a new form of tracking the telecom industry has deployed to shadow mobile phone users. Last year, Verizon and AT&T users noticed their carriers were inserting a tracking number into all the Web traffic that transmits from a users' phone - even if the user has tried to opt out.

Users complained that the tracking number could be used by any website they visited from their phone to build a dossier about their behavior - what sites they went to, what apps they used.

Over the past five years we've seen technologies like 3D printing go from making plastic cubes, to making plastic firearms. It's a huge game changer that allows the individual to make tools that once required a factory full of workers to build. It has essentially lowered the barrier to entry for the manufacturing industry, and as this technology progresses, it could fundamentally change the world we live in.

But does 3D printing stand alone in this regard? Are there other emerging technologies that might democratize fields beyond manufacturing, such as medicine or energy production? Surely, we could benefit from devices that allow the every man to diagnose their own ailments, or cheaply produce all their energy needs. But what about genetic engineering? What if everyone could access the tools required to modify DNA, and do so in the comfort of their own home?

Lost sleep at night, fingers tapping on the keyboard by day. Darn comets are keeping me busy! But of course that's a good problem. Comet 15P/Finlay, which had been languishing in the western sky at dusk at magnitude +10, has suddenly come to life ... for a second time.

Two nights ago, Australian comet observer Michael Mattiazzo took a routine picture of Finlay and discovered it at magnitude +8. Today it's a magnitude brighter and now joins Comet Lovejoy as the second binocular comet of 2015. Comet-wise, we've gone from zero to 60 and the new year's fewer than 3 weeks old!

A team of scientists, in a groundbreaking analysis of data from hundreds of sources, has concluded that humans are on the verge of causing unprecedented damage to the oceans and the animals living in them.

"We may be sitting on a precipice of a major extinction event," said Douglas J. McCauley, an ecologist at the University of California, Santa Barbara, and an author of the new research, which was published on Thursday in the journal Science.

But there is still time to avert catastrophe, Dr. McCauley and his colleagues also found. Compared with the continents, the oceans are mostly intact, still wild enough to bounce back to ecological health.

"We're lucky in many ways," said Malin L. Pinsky, a marine biologist at Rutgers University and another author of the new report. "The impacts are accelerating, but they're not so bad we can't reverse them."

Scientific assessments of the oceans' health are dogged by uncertainty: It's much harder for researchers to judge the well-being of a species living underwater, over thousands of miles, than to track the health of a species on land. And changes that scientists observe in particular ocean ecosystems may not reflect trends across the planet.

As thunderous tones deepen, their power seemingly intensifies over frail barriers such as glass windows. Certain abrupt thunder peals often shatter windows into tiny fragments. In the apparent absence of thunderous tones we may observe the strong and continuous vibration of glass window panes during storms. A sudden eerie silence, and the window is shattered before our eyes.

Natural phenomena are prodigious generators of infrasound. The potent distal effects produced when natural explosions occur produce legendary effects. When Krakatoa exploded, windows were shattered hundreds of miles away by the infrasonic wave. Wind was not the causative agent of these occurrences, as no wind was felt or detected. Seismographic stations registered the blast, and barometers measured the shockwaves. The "ringing" of both earth and atmosphere continued for hours. It is believed that infrasound actually formed the upper pitch of this natural volcanic explosion, tones unmeasurably deep forming the actual "central harmonic" of the event. The island of Krakatoa was literally lifted into orbit in the fatal blast. Brilliant sunsets followed for many years thereafter, the sad memorial of all the souls who perished.

The power of explosives, in shattering and devastating property, lies in two zones. The first zone is that with which we are principally familiar; the actual blast site, where chemically released gases and metal fragments push back everything in their perimeter. The second less familiar zone extends very much further from the blast site than can be imagined. It is in the powerful sonic wave which expands outward that an equally destructive danger lies. Thick pressure walls of incredible momentum, interspaced with equally thick walls of reduced air pressure, travel far away from the blast site. The blast site is the small destructive zone by comparison. Few objects can survive this destructive tide.

Female sea turtles, known to swim thousands of miles before returning to their birthplace to lay eggs, find their way home by relying on unique magnetic signatures along the coast, a new study finds.

For more than 50 years, scientists have been mystified by how sea turtles do this, said the study's lead researcher, J. Roger Brothers, a graduate student of biology at the University of North Carolina at Chapel Hill.

"Our results provide evidence that turtles imprint on the unique magnetic field of their natal beach as hatchlings, and then use this information to return as adults," Brothers said in a statement.

Two miles below the surface of the ocean, researchers have discovered new microbes that 'breathe' sulfate.

The microbes, which have yet to be classified and named, exist in massive undersea aquifers - networks of channels in porous rock beneath the ocean where water continually churns, researchers say.

About one-third of the Earth's biomass is thought to exist in this largely uncharted environment.

Could there be another Pluto-like object out in the far reaches of the Solar System? How about two or more?

Earlier this week, we discussed a recent paper from planet-hunter Mike Brown, who said that while there aren't likely to be any bright, easy-to-find objects, there could be dark ones "lurking far away." Now, a group of astronomers from the UK and Spain maintain at least two planets must exist beyond Neptune and Pluto in order to explain the orbital behavior of objects that are even farther out, called extreme trans-Neptunian objects (ETNO).

Often enough, it is human nature to conform. This tendency makes us follow the lead of computers, even if the machines give us the wrong advice. This is the finding of a study in Springer's journal Psychonomic Bulletin & Review that investigates how people make judgment calls after playing role-playing video games. The research was led by Ulrich Weger of the University of Witten/Herdecke in Germany.

Real-life encounters and face-to-face contact with other people are on the decline in a world that is becoming increasingly computerized. Many routine tasks are delegated to virtual characters. People spend hours role-playing through virtual-reality video games by taking on the persona of a virtual character or avatar.

Such video games can even lead people to acquire and practice real-life skills and new viewpoints. Weger and his fellow researchers therefore explored how role-playing video gaming influences social behavior and decision-making. Participants in their study first played an immersive game for seven minutes as an avatar. Afterwards, they completed a job selection task in which they had the option of overriding incorrect choices made by a computer.

It was found that role-playing as the avatar in an immersive video game, compared to merely watching others play, makes people identify with a computer. They do so to such an extent that they actually start to conform to its decisions and follow its judgment -- sometimes even if it is downright wrong. This shows that people conform, even when opinions are voiced by nonhuman agents. This is especially prevalent in ambiguous cases.

People whose blood type is A, B or AB have an increased risk of heart disease and shorter life spans than people who have type O blood, according to a new study.

But that doesn't mean people with blood types other than O should be overly concerned, because heart disease risk and life span are influenced by multiple factors, including exercise and overall health, experts said.

In the study, researchers followed about 50,000 middle-age and elderly people in northeastern Iran for an average of seven years. They found that people with non-O blood types were 9 percent more likely to die during the study for any health-related reason, and 15 percent more likely to die from cardiovascular disease, compared with people with blood type O.

"It was very interesting to me to find out that people with certain blood groups - non-O blood groups - have a higher risk of dying of certain diseases," said the study's lead investigator, Dr. Arash Etemadi, an epidemiologist at the U.S. National Institutes of Health.

The researchers also examined whether people's blood type may be linked with their risk of gastric cancer, which has a relatively high incidence rate among the people living in northeastern Iran. They found that people with non-O blood types had a 55 percent increased risk of gastric cancer compared with people with type O blood, according to the study, published online today (Jan. 14) in the journal BMC Medicine.

The association between blood type and people's disease risk and life span held even when the researchers accounted for other factors, including age, sex, smoking, socioeconomic status and ethnicity.

Previous studies have shown that people with non-O blood types may be at higher risk of certain cancers and cardiovascular disease, but it was less clear whether blood type is linked with life span, Etemadi told Live Science.