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8,133 articles mezi dny 1.8.2012 a 31.8.2012
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FRIDAY 31. AUGUST, 2012
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23:59
This column will change your life: has Pelmanism's time come at last?
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23:55
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23:48
Genome of Denisovan cave girl sheds light on human ancestry
Scientists have sequenced the complete genome of a Denisovan, an ancient human, from a tiny finger bone fragment from a young girl who lived between 74,000 and 82,000 years ago.
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23:34
Science Fiction or Fact: A Planet-Destroying Superweapon
In this occasional series, Life's Little Mysteries explores the plausibility of popular science fiction concepts. -
23:25
Solar storms can destabilize power grids at midlatitudes
The Sun is capable of disrupting electrical systems on Earth in a variety of ways, from solar flares and coronal mass ejections to proton storms. Typically, it is only objects far above the Earth's surface, or systems at high altitudes at polar latitudes, that are considered at risk except during the most powerful storms. Notable recent examples include solar activity during March 1989 and October 2003 (the "Halloween Storms"), which knocked out power in Quebec, Canada, and Sweden, respectively. Research by Marshall et al., however, finds that even a moderate event can have destructive effects far from the typical regions of concern. -
23:25The Amazon basin is an important sink of carbon dioxide, but it is also a substantial source of atmospheric methane. Tropical wetlands, including those in the Amazon, are one of the largest sources of biogenic methane and globally represent roughly 13 percent of annual emissions of the greenhouse gas. Other sources of methane include fossil fuel or biomass burning. Through two intensive atmospheric methane sampling campaigns, Beck et al. determine the sources of Amazonian methane.
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22:53
The late astronaut Neil Armstrong, first man on the moon, was memorialized in ceremonies around the country on Friday (Aug. 31).
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22:39
Venus the Two-Faced Cat Still a Mystery
Just how Venus the cat got a two-colored face and a rare blue eye is unknown, an expert says.
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22:38
(Reuters) - As Tropical Storm Isaac was on its path through the Caribbean before becoming a hurricane in the Gulf of Mexico this week, U.S. scientists were testing an experimental new weather spy tool - an unmanned, marine robot about the size of a surfboard that can gather storm data at sea level. A National Oceanic and Atmospheric Administration (NOAA)research laboratory in Miami sent the "Wave Glider," a floating platform of sensors with an underwater stabilizer christened Alex, into ocean waters about 100 miles north of Puerto Rico last week to try to intercept Isaac. ...
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22:30
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22:08
Neil Armstrong was a humble hero who saw himself as a team player and never capitalized on his celebrity as the first man to walk on the moon, mourners said Friday outside a private service attended by fellow space pioneers, including his two crewmates on the historic Apollo 11 mission.
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22:03A stuck squirrel, a modern-day mummy ritual, and a police officer-turned-seagull feature among our favorite pictures of the month.
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21:24A team of engineers at Stanford has demonstrated the feasibility of a super-small, implantable cardiac device that gets its power not from batteries, but from radio waves transmitted from outside the body. The implanted device is contained in a cube just eight-tenths of a millimeter in radius. It could fit on the head of pin.
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21:24(AP)—Neil Armstrong was a humble hero who saw himself as a team player and never capitalized on his celebrity as the first man to walk on the moon, mourners said Friday outside a private service attended by fellow space pioneers, including his two crewmates on the historic Apollo 11 mission.
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21:24You can probably recall a customer service experience that left you feeling good. A recent study has shown not only that positive emotion from sales staff is contagious to a customer, but that a satisfied customer also improves the salesperson's mood. This research is now available in Human Relations.
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21:24(Phys.org)—Three of the largest and deadliest earthquakes in recent history occurred where earthquake hazard maps didn't predict massive quakes. A University of Missouri scientist and his colleagues recently studied the reasons for the maps' failure to forecast these quakes. They also explored ways to improve the maps. Developing better hazard maps and alerting people to their limitations could potentially save lives and money in areas such as the New Madrid, Missouri fault zone.
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21:24Google Inc. bought ailing mobile device maker Motorola Mobility this year to stockpile patents for the war that was heating up with rival Apple Inc.
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21:24International collaboration is a key aspect of the globalization of science and engineering. A recent report and data evaluation released by the National Science Foundation (NSF) showed that one in six scientists and engineers in the United States reported working with individuals in other countries in a given week.
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21:24Reef-building coral communities in the Great Barrier Reef-the world's largest coral reef-may now be calcifying at only about half the rate that they did during the 1970s, although live coral cover may not have changed over the past 40 years, a new study finds. In recent decades, coral reefs around the world, home to large numbers of fish and other marine species, have been threatened by human activities such as pollution, overfishing, global warming, and ocean acidification; the latter affects ambient water chemistry and availability of calcium ions, which are critical for coral communities to calcify, build, and maintain reefs.
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21:24NASA is relying on a small team of engineers at its Ames Research Center at California's Moffett Field to develop three nanosatellites operated by smartphones.
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21:24On 11 April 2012, an 8.6 magnitude earthquake occurred 100 kilometers (62 miles) off the coast of Sumatra. This earthquake was unusual in that it originated within the plate rather than at a plate boundary. In fact, it is the largest such earthquake in observed human history. The quake originated under the Wharton Basin in the Indian Ocean, where hundreds of kilometers of rock were under crushing tension, causing the plate to deform at its base. But this deforming zone was also absorbing tension as two plates, the Indian and Australian plates, rotated toward each other.
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21:24A major international conference reviewing the aftermath of the Fukushima disaster in Japan in March 2011 wrapped up Friday calling for more to be done to improve nuclear safety.
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21:24(Phys.org)—What about using the same mobile device touchscreens used every day for direct authentication? What if your touch alone identifies you by code from the ring on your finger? A team from the WINLAB at Rutgers University has turned the what-ifs into a device that makes use of capacitive touchscreens on phones and tablets to confirm the user's identity. The device can provide an additional layer of protection alongside passwords. The device can send a few bits of data representing a password from a special battery powered ring (with flash memory) on the finger. The data is sent as tiny voltage bursts through the wearer's skin for phone-screen capture.
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21:24Since 1985, a state agency has constructed and continues to maintain hundreds of square kilometers of wetlands built to regulate the amount of nutrients reaching the Everglades in southern Florida. But this is proving to be ineffective in controlling concentrations of phosphorous, a key nutrient, in the surface waters of the wetland, a new study by Zapata-Rios et al. shows. Historically, the Everglades have been a nutrient-poor environment, a characteristic that determines the delicate ecological balance and distinct flora and fauna in this region.
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21:24Earth's growing human population needs fresh water for drinking and food production. However, fresh water is also needed for the growth of biomass, which acts as a sink of carbon dioxide and thus could help mitigate climate change. Does the Earth have enough freshwater resources to meet these competing demands?
Naposledy aktualizované zdroje
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BBC Science/Nature (dnes, 12:03)
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Technology Review Feed - Tech Review Top Stories (dnes, 06:56)
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EurekAlert (dnes, 06:00)
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NASA (dnes, 04:11)
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ScienceNOW (dnes, 02:30)
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ScienceDaily (18. 6, 23:26)
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NYT > Science (18. 6, 18:29)
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Sci-Tech Today (18. 6, 18:14)
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Discovery (7. 3, 18:11)
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TIME (27. 7, 08:30)
