
Why is milk white?
Why do onions make your eyes water?
Why does Swiss cheese have holes in it?
Where do French fries come from?
Is there a difference between jelly and jam?


An 18th-century vagabond in England, exhausted and famished, came to a roadside inn with a sign reading, “George and the Dragon.” He knocked.

To obtain sufficient moisture for photosynthesis and growth, redwoods reach into the air with leaves shaped like baseball mitts and capture the fog that rolls in by night and languishes through most mornings. "From 25 to 40 percent of the moisture in the system comes from fog," says Dawson, who has been studying the relationship between the coastal fog and the redwoods for two decades. Some of the fog simply covers the leaves and prevents evaporation. But some of it also enters the stomata, or tiny pores, on the leaves and is drawn down through the branches to the roots. This is the reverse of transpiration, the normal flow of water from the roots to the leaves that exists in most trees. Redwoods are the first trees found to move water in both directions, though others have been identified.
Fog is not just a vital element for the redwoods—it's also crucial to the entire redwood forest ecosystem. Some of the moisture drips off the redwood leaves, landing on the forest floor to water the trees and young saplings. "It's not just a drip, drip, drip," says ecologist Holly Ewing of Bates College in Lewiston, Maine, who also worked with Dawson. "The moisture can descend into the ground up to 35 centimeters deep, and that's a lot of water."

Via Brazilian myrmecologist Rodrigo Feitosa comes this shot of conjoined leafcutter ant sisters. Two fully grown adult ants dorsally fused from abdominal segments 3 onward.
Incredibly, this developmental oddity was observed carrying leaf fragments in a foraging trail.
The spur of the flower is 20–35 cm (7.9–14 in) from its tip to the tip of the flower's lip. The name "sesquipedale" is Latin for "one and a half feet," referring to the spur length... The moth approaches the flower to ascertain by scent whether or not it is the correct orchid species. Then the moth backs up over a foot and unrolls its proboscis, then flies forward, inserting it into the orchid's spur.

Independent groups that do not disclose the identity of their donors spent $132.5 million to influence elections nationwide this year, accounting for about a third of all spending by outside groups in the 2010 election cycle, a report released Friday found.
The analysis by the office of New York City Public Advocate Bill de Blasio aimed to quantify how federal campaigns had been affected by the Supreme Court's so-called Citizens United ruling. The ruling, handed down in January, cleared the way for companies and labor unions to spend unlimited funds to influence elections, often using money from anonymous donors.
Mark Madoff, the elder son of convicted swindler Bernard Madoff, was found hanged in his New York City apartment in an apparent suicide, police said on Saturday.
"He was found hanged in his apartment. It was an apparent suicide," New York City police spokesman Paul Browne said.
Mark Madoff, 46, was found dead on the two-year anniversary of the arrest of his father. Bernard Madoff is now serving a 150-year prison sentence after confessing to running a decades-long Ponzi scheme that bilked investors out of millions.




Two erroneous $11 doctor bills stopped Jeanne White from refinancing her home.
The 49-year-old resident of Colleyville, Texas, pays 7% on the mortgage for her three-bedroom house. In October, she says, she was shocked to learn that the two medical bills, which had been turned over to a collection agency, had caused her credit score to fall to 680 from 757—making refinancing far too expensive.
"I was told I'd have to pay $14,000 in closing costs to get a 5.5% interest rate," Ms. White says, substantially more than she would have paid with a higher credit score. When Ms. White, a retired sales manager, contacted the doctor's office, she found out the bills had been issued in error.
Ms. White's case is hardly an isolated one. Otherwise well-qualified borrowers with good loan-to-value ratios and steady employment are increasingly finding it difficult to refinance because of medical billing mistakes marring their credit, say mortgage bankers and real-estate agents.
Jeanne White of Colleyville, Texas, saw her refinancing costs skyrocket after her credit score was dinged by two disputed $11 doctor bills—and is now in limbo as interest rates rise.
Rodney Anderson, executive director of Supreme Lending, a mortgage bank in Plano, Texas, calls medical debt the single biggest roadblock for would-be refinacers. "People have no idea that they still owe small amounts which later end up on their credit report," he says.
An electromagnetic railgun offers a velocity previously unattainable in a conventional weapon, speeds that are incredibly powerful on their own. In fact, since the projectile doesn’t have any explosives itself, it relies upon that kinetic energy to do damage. And at 11 a.m. today, the Navy produced a 33-megajoule firing — more than three times the previous record set by the Navy in 2008.[...]
Ellis says the Navy has invested about $211 million in the program since 2005, since the railgun provides many significant advantages over convention weapons. For one thing, a railgun offers 2 to 3 times the velocity of a conventional big gun, so that it can hit its target within 6 minutes. By contrast, a guided cruise missile travels at subsonic speeds, meaning that the intended target could be gone by the time it reaches its destination.
Furthermore, current U.S. Navy guns can only reach targets about 13 miles away. The railgun being tested today could reach an enemy 100 miles away. And with current GPS guidance systems it could do so with pinpoint accuracy. The Navy hopes to eventually extend the range beyond 200 miles.
Jim Oberg, a space journalist who worked at the space shuttle’s mission-control center for 22 years and specialized in rendezvous procedures, weighs in on the options for rescue. The station’s robotic arm, he explains, is usually not within range of where the astronauts work and moves too slowly to grab someone. The Soyuz vehicles need a full day to power up and undock. By then, the carbon dioxide filters in the astronaut’s spacesuit would run out, asphyxiating him. And the ISS cannot redirect its positioning rocket quickly enough to catch up to a runaway astronaut.
In a worst-case situation, the only rescue option, according to Oberg, would be for a second astronaut to link together several tethers end-to-end, attach them to the station, and then use his Safer pack to jet over to his crewmate and haul him in. Certain conditions could make a rescue easier, he says. If an astronaut floated away more or less at a right angle from the station’s orbit, orbital dynamics (which require too much math to explain here) dictate that he would float back toward the station in about an hour.
Young first came up with the ball bearings idea when he noticed that carved stone balls were often found near Neolithic stone circles in Aberdeenshire, Scotland (map).
“I measured and weighed a number of these stone balls and realized that they are all precisely the same size—around 70 millimeters [3 inches] in diameter—which made me think they must have been made to be used in unison, rather than alone,” he told National Geographic News.
The balls, Young admitted, have been found near stone circles only in Aberdeenshire and the Orkney Islands (map)—not on Stonehenge’s Salisbury Plain.
But, he speculated, at southern sites, including Stonehenge (map), builders may have preferred wooden balls, which would have rotted away long ago. For one thing, wooden balls are much faster to carve. For another, they’re much lighter to transport.