The 2014 film about his life, "The Theory of Everything," was nominated for several Academy Awards and Eddie Redmayne, who played Dr. Hawking, won the best-actor Oscar. Scientifically, Dr. Hawking will be best remembered for a discovery so strange that it might be expressed in the form of a Zen koan: When is a black hole not black? When it explodes. A brief history of Stephen Hawking: A legacy of paradox.
We will also see this with self driving. Probably by next year, self driving will encompass all forms of driving. By the end of next year, it will be at least 100 percent safer than humans. [...] The rate of improvements is really dramatic and we have to figure out some way to ensure that the advent of digital super intelligence is symbiotic with humanity. I think that's the single biggest existential crisis we face, and the most pressing one. I'm not generally an advocate of regulation -- I'm actually usually on the side of minimizing those things. But this is a case, where you have a very serious danger to the public. There needs to be a public body that has insight and oversight to ensure that everyone is developing AI safely. This is extremely important. The danger of AI is much greater than danger of nuclear warheads. By a lot.
Their work, published in the journal Physical Review Letters, uses the weird quantum properties of light to counteract interference from turbulence in the air to allow interferometer measurements to be made. Their method, which is a variation on the classic Young's double-slit experiment, has been demonstrated in a tabletop experiment — but gravitational wave scientists are skeptical that it could be scaled up to remove sophisticated vacuums from their detectors.
What has been interesting to watch about this unexpected development is that science journalists have so far not explicitly reported this as a shift in theory, and commenters on sites like phys.org appear to deny that any change has even occurred: "The jets have been shown not to be electric currents, the energy and the physics involved are certainly not electromagnetic." This comment completely rejecting these new findings was highly rated by other phys.org readers, suggesting that the failure to explicitly report this as a change in theory has left this controversial topic in a highly confused state.
The paper summarizes what it calls "observational evidence for the existence of large scale electric currents and their associated grand design helical magnetic fields in kpc-scale astrophysical jets." And the original submitter details the history of the question in a follow-up comment arguing that at our current moment in time, "a mistaken bias against electricity in space continues to dominate conversations."
The FCC told the startup that the agency would assess "the impact of the applicant's apparent unauthorized launch and operation of four satellites... on its qualifications to be a Commission licensee." If Swarm cannot convince the FCC otherwise, the startup could lose permission to build its revolutionary network before the wider world even knows the company exists. An unauthorized launch would also call into question the ability of secondary satellite "ride-share" companies and foreign launch providers to comply with U.S. space regulations.
In the new study, the Emory researchers discovered two strains of CRKP -- isolated from the urine of patients in Atlanta, Georgia -- that can also resist colistin. But they do so in a poorly understood, surreptitious way. At first, they appear vulnerable to the potent antibiotic in standard clinical tests, but with more advanced testing and exposure to the drug, they reveal that they can indeed survive it. In mice, the strains caused infections that couldn't be cured by colistin and the mice died of the infections. Mice infected with typical CRKP were all saved with colistin. So far, there's no evidence of CRKP infections surprisingly turning up resistant to colistin during treatment in patients. But the authors, led by microbiologist David Weiss, say that may be because the evidence is difficult to gather, and the data so far is cause for concern. The researchers concluded that the findings "serve to sound the alarm about a worrisome and under-appreciated phenomenon in CRKP infections and highlight the need for more sensitive and accurate diagnostics."
The study found that most of the Bay's coastline is sinking at a rate of less than 2 millimeters a year -- and while that may not sound like a lot, the millimeters can add up fast. "You talk to someone about, 'Oh the land is going down a millimeter a year,' and that can be kind of unimpressive," says William Hammond, a researcher at the University of Nevada Reno who studies subsidence (but was not involved in this particular project). "But we know as scientists that these motions, especially if they come from plate tectonics, that they are relentless and they will never stop, at least as long as we're alive on this planet."
Fu's lab specializes in analyzing the cybersecurity of devices connected to the Internet of Things, such as sensors, pacemakers, RFIDs, and autonomous vehicles. To Fu, the ripples in the spectral readout suggested some kind of interference. He discussed the AP clip with his frequent collaborator, Wenyuan Xu, a professor at Zhejiang University, in Hangzhou, China, and her Ph.D. student Chen Yan. Yan and Xu started with a fast Fourier transform of the AP audio, which revealed the signal's exact frequencies and amplitudes. Then, through a series of simulations, Yan showed that an effect known as intermodulation distortion could have produced the AP sound. Intermodulation distortion occurs when two signals having different frequencies combine to produce synthetic signals at the difference, sum, or multiples of the original frequencies. Having reverse engineered the AP audio, Fu, Xu, and Yan then considered what combination of things might have caused the sound at the U.S. embassy in Cuba. "If ultrasound is to blame, then a likely cause was two ultrasonic signals that accidentally interfered with each other, creating an audible side effect," Fu says. "Maybe there was also an ultrasonic jammer in the room and an ultrasonic transmitter," he suggests. "Each device might have been placed there by a different party, completely unaware of the other."
The Illmans took their discovery to the Western Australian Museum, which verified that the bottle and the note date back to the 19th century. The museum contacted experts in the Netherlands and Germany for more information, and confirmed that the bottle had been dropped from a German vessel called the Paula. A search of German archives uncovered the Paula's original Meteorological Journal, and in a captain's entry from June 12, 1886, researchers discovered a reference to the bottle, thrown overboard as the ship was sailing from Cardiff, Wales, to Makassar, Indonesia. The date and the coordinates matched. The bottle had been tossed into the Indian Ocean from the ship as part of a decades-long experiment by the German Naval Observatory to understand ocean currents. Thousands of bottles were thrown into the ocean around the world from German ships between the 1860s and the 1930s, each with a form bearing the date and location where it had been tossed into the sea, the name of the ship, its home port and the travel route, the Western Australian Museum said.