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Astronomers studying an unusual black hole system have spotted a never-before-seen structure in the disk of matter encircling the system.

Swift J1357.2, an X-ray binary system that regularly emits outbursts of high energy, consists of a black hole slowly consuming its companion star. Matter from the doomed star falls into the accretion disk, which surrounds the black hole, feeding it dust and gas. While observing the system, a team of scientists noticed an unusual vertical feature traveling through the material.

In early February, a leaked white paper from the Obama Justice Department caused a small stir, because it laid out an expansive set of circumstances under which the president could order a citizen killed abroad. In September 2011, the US killed Al Qaeda propagandist Anwar al-Awlaki and Samir Khan, both US citizens, and a few weeks later a US drone strike in Yemen also killed Awlaki's 16-year-old son, Abdulrahman.

Early claims from US officials were that Abdulrahman was over 21 and a fighter for Al Qaeda at the time of his death, though those were walked back after relatives in America provided a birth certificate that showed he was born in Denver in 1995. It's not clear if Abdulrahman was specifically targeted or merely collateral damage in a strike that killed an adult and another teenager.

Astronomers studying the disc of gas and dust surrounding the young star HD 100546, which at 335 light-years is relatively near to Earth, believe they are witnessing the birth of a gas giant similar to Jupiter, although up to three times larger.

If their discovery is confirmed, it would allow huge leaps in our understanding of how planets take shape by allowing scientists to compare their theories against direct observations from the new planet.

Children born outside the United States have lower rates of allergies, but after prolonged U.S. residence, reduced prevalence is reversed, researchers say.

Dr. Jonathan I. Silverberg of St. Luke's-Roosevelt Hospital Center and colleagues at the State University of New York Downstate Medical Center and Oregon Health Science Center examined a sample of nearly 92,000 children from the 2007-08 National Survey of Children's Health.

On the evening of Feb. 18, Israeli authorities arrested Arafat Jaradat, 30, on suspicion that he had thrown stones at Israeli soldiers. Five days later, he was dead. Now his story has come to symbolize what many Palestinians and human rights groups say are the torturous interrogation methods used by Israel’s internal security service, the Shin Bet.

A spokeswoman for Israel Prison Services, Sivan Weizman, originally said that Jaradat had died in Meggido Prison of a heart attack. But a different picture emerged when Israel’s Ministry of Health released a statement describing what doctors found during their autopsy.

Illinois Democrats sent a message Tuesday night about guns and the power of New York City Mayor Michael Bloomberg, as they nominated Robin Kelly in a special election primary for Congress.

Kelly, a former state representative, supports an assault weapons ban. She is now heavily favored in the race to replace Democrat Jesse Jackson Jr. in the Chicago-based district.

Tony Blair has told how people are still “very abusive” to him 10 years after the Iraq War, adding that he has given up trying to “persuade people it was the right decision”.

In comments which could be interpreted as self-pitying Mr Blair said that it did not matter whether the continuing controversy about Iraq had “taken a toll on me”. He said that Iraq’s Saddam Hussein was “20 times as bad” as Syria’s President Assad but admitted that it would take a “generation” to make Iraq safer than it was in 2003.

Researchers have demonstrated a flat, "stretchy" battery that can be pulled to three times its size without a loss in performance. While flexible and stretchable electronics have been on the rise, powering them with equally stretchy energy sources has been problematic.

The new idea in Nature Communications uses small "islands" of energy-storing materials dotted on a stretchy polymer. The study also suggests the batteries can be recharged wirelessly.