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Science

Why Fingernails On a Chalkboard Sound Painful 176

sciencehabit writes "Some sounds are excruciating. Take fingernails squeaking on a chalkboard. The noise makes many people shudder, but researchers never knew exactly why. A new study finds that there are two factors at work: the knowledge of where the sound is coming from and the unfortunate design of our ear canals. 'The offending frequencies were in the range of 2000 to 4000 Hz. Removing those made the sounds much easier to listen to. Deleting the tonal parts of the sound entirely also made listeners perceive the sound as more pleasant, whereas removing other frequencies or the noisy, scraping parts of the sound made little difference.'"
Iphone

iPhone 4S Has Been Jailbroken, Hack Enables Siri on iPhone 4 148

Diggester writes "Unless their chipset has already been exploited and jailbroken on a previous device, it takes a lot of time for the iOS jailbreaking community to jailbreak for a new iOS device. The iPhone 4S and iPad 2, both of which are based on a still unexploited dual-core A5 chip, haven't received a jailbreak for iOS 5 yet. However, it appears they'll be getting one soon, as a certain eminent iPhone hacker has let us know that the iPhone 4S has jailbroken, and a jailbreak for the iPad 2 is in the works." In related news, Hackers have succeeded in bringing a limited port of Apple's new Siri voice assistant feature onto jailbroken versions of the iPhone 4 and the fourth-generation iPod touch.
NASA

Europa Selected As Target of Next Flagship Mission 168

volcanopele writes "NASA and the European Space Agency announced today that they have selected the Europa/Jupiter System Mission as the next large mission to the outer solar system. For the last year, the Europa mission has been in competition with a proposal to send a mission to Saturn's moon Titan, as reported on Slashdot earlier. The Europa Mission includes two orbiters: one developed by NASA to orbit the icy moon Europa and another developed by ESA to orbit the solar system's largest moon, Ganymede. Both orbiters would spend up to 2.5 years in orbit around Jupiter before settling into orbit around their respective targets, studying Jupiter's satellites, rings, and of course the planet itself. The mission is scheduled to launch in 2020 and arrive at Jupiter in 2025 and 2026."

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