Global leaders speak at a memorial Tuesday honoring former South African president Nelson Mandela.
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If you missed out on the Twitter IPO, good for you. The more buzz an IPO creates, the greater the likelihood the guys behind the deal make a killing and the average investor gets hosed. Marketwatch’s Chuck Jaffe joins MoneyBeat.
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A three-man crew successfully carried the Olympic torch aboard the International Space Station on Thursday.
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Buzz Aldrin says colonising Mars is critical to the human race. Source: AFP
HIS footprint on the surface of the moon is one of the most enduring images in history.
But Buzz Aldrin, the second man to walk on the moon, confesses he thought the moon was “desolate” not ”beautiful” as described by Neil Armstrong who walked the moon first, the Daily Mail UK reports.
In an interview that aired in the UK on Friday night, Aldrin said: “Neil had an optimistic way of using the word ‘beautiful’. But when I looked out, it wasn’t beautiful. It was desolate – totally lifeless.”
Aldrin was also quizzed about whether Armstrong had prepared his infamous “one step for man” line, saying Armstrong had time to think about it while they prepared for the moon landing.
The brave astronaut also responded to criticism of current spending to colonise Mars, saying it’s necessary for the survival of the human race.
And he said it can be achieved because of the power of technology.
“What did we have in the sixties and seventies? Undisputed leadership in the world in technology, as exhibited by the Apollo Programme,” he said.
“Look at what Silicon Valley has done – the advance of computers. We lead the world….and in these hard economic times, we need to inspire people.”
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Few recent TV events — leaving aside the Super Bowl and the Academy Awards — have generated as much heat online as “Sharknado,” the TV movie that took Twitter by storm on Thursday night. By the time Mia Farrow weighed in, everyone but Hannah’s sisters seemed to have been sucked into the Tara Reid vehicle with the self-explanatory title.
And yet cable network SyFy (rebranded in 2009 from its stodgy Sci Fi roots) saw not much of a ratings boost from its wild night of carnivorous fish flying through air. With fewer than 1 million viewers, the movie was below even the average for SyFy’s movie offerings.
And yet SyFy brass profess to be unworried. In an interview, Thomas Vitale, the executive vice president of programming and original movies for the network, described the strategy underpinning “Sharknado” — reverse-engineering the sort of spectacle that would draw in attention and build brand awareness, regardless of a single night’s ratings. While every network cares about ratings to some degree, Vitale described a splintered media landscape in which SyFy — still working to build awareness after its rebrand — must fight to bring in new viewers to its offerings nightly. Ratings aside, Vitale said, “Sharknado” is a boon for the network’s movie franchise and the network itself; what follows is a look at what a social-media hit can and cannot do for a basic-cable network.
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Floral electric fields could join color and fragrance as cues to pollinators
By Susan Milius
Web edition: February 21, 2013
ELECTRIC SIDE
On the right-hand halves of flowers, a dusting of electrically charged particles (color in adjacent rectangle) reveals natural patterns. Bees can sense at least simple patterns in floral electrical charges, new research says.
Credit: D. Clarke et al./Science 2013
Slight electric fields that form around flowers may lure pollinators much as floral colors and fragrances do.
In lab setups, bumblebees learned to distinguish fake flowers by their electrical fields, says sensory biologist Daniel Robert at the University of Bristol in England. Combining an electrical charge with a color helped the bees learn faster, Robert and his colleagues report online February 21 in Science.
Plants, a bit like lightning rods, tend to conduct electrical charges to the ground, Robert says. And bees pick up a positive charge from the atmosphere’s invisible rain of charged particles.
“Anything flying through the air, whether it’s a baseball, 767 jumbo jet, or a bee, acquires a strong positive electrostatic charge due to interaction with air molecules,” says Stephen Buchmann of the University of Arizona in Tucson.
Robert and his colleagues checked whether bees could choose flowers based solely on the electric fields the plants produce. Purple metal disks (encased in plastic so as not to shock bees) stood in for flowers. Half of them, wired for 30 volts, held sips of sugar water. The unwired ones offered a bitter quinine solution that bees don’t like.
MODEL FLOWER
A computer model predicts the electric potential of a typical flower blooming 30 centimeters above the ground (left: dark blue, 0 volts; dark red, 35 volts) and its electric field (right; dark blue, 0 volts per meter; dark red 2,000 volts per meter).
Credit: D. Clarke et al./Science 2013
Bombus terrestris bumblebees learned to chose sweet, wired disks more than 80 percent of the time. When researchers unplugged the wired disks, the bees bumbled, scoring sugar only by chance.
“The big question is how bees do this,” says Lars Chittka of Queen Mary University of London. Bees bristle with hairs, and he speculates that a charged insect nearing an oppositely charged flower feels the hairs bend.
Electric charges of bees and flowers do interact, Robert confirmed after studying bees visiting real petunias. When a bee landed, and sometimes even before, flower stems registered an electrical surge that didn’t fade until after the bee had buzzed onward.
This surge in electric potential might tip off another passing bee that the flower had just lost nectar to a different visitor, a change that scent or color would not reveal. Roberts says, channeling a petunia: “I’m still pretty and smell nice, but my potential tells you to come back later.”
Variations within a flower’s electric field may even hold clues to where bees should probe for nectar, Robert speculates. Researchers found striking electrical patterns when they wafted positively charged colored aerosol particles over blooms.
“I am blown away,” said Anne Leonard of the University of Nevada, Reno. “I imagine that we’ll all be desperate to spray our flowers down with the aerosol they describe.”
Bumblebees can distinguish at least between simple electrical patterns, Robert says. They learned to fly to disks with a negatively charged bulls-eye ringed with a positive charge instead of to disks producing a uniform field.
Charge patterns can also reinforce other flower advertisements, the researchers found. Bees challenged to learn to distinguish two slightly different shades of green learned faster when researchers paired each shade with a distinctive electric charge.
In the real world, bees face a marketing barrage of combined scents, colors and other cues from flowers. “One open question in behavior is when are such cues used, and when are they ignored,” says Robert Raguso of Cornell University. Pollinators need to find their next meal before they run out of fuel, and if a cue such as humidity or electrical charge can let them make snap judgments to save resources, he predicts bees would pay attention.
Suggested Reading
A.S. Leonard and D.R. Papaj. ‘X’ marks the spot: The possible benefits of nectar guides to bees and plants. Functional Ecology. Vol. 25, 2011, p. 1293. doi: 10.1242/jeb.047407.
M. von Arx et al. Floral humidity as a reliable sensory cue for profitability assessment by nectar-foraging hawkmoths. Proceedings of the National Academy of Sciences. Vol. 109, June 12, 2012, p. 9471. doi: 10.1073/pnas.1121624109 [Go to]
R. Ehrenberg. Jiminy Cricket! Pollinator caught in the act. Science News Online. Posted Jan.18, 2010. [Go to]
S. Milius. Big study—Selective pollinators are declining. Science News. Vol. 170, July 22, 2006, p. 51. [Go to]
