123 mm = 12 stacked CD cases. 6 miles = 30 Eiffel Towers. 5 acres = 11 ice hockey rinks. Sensibleunits.com
converts any length, area or mass into real objects.
posted by gottabefunky
on Jun 5, 2008 -
Redefining Avogadro's Number.
A mole is the number of molecules in a gram of water: ~6.022 x 1023
. Unfortunately "a gram" is defined by a chunk of metal
in a vault
in France, the last of the seven SI units still defined by a physical artifact. Since the reference mass (known as "Le Gran K") is actually changing over time
(due to cleaning, handling, etc), the definition of a gram is currently temporally unstable. Now a new proposal
has been put forward to explicitly define the number to be a known integer: 602,214,141,070,409,084,099,072, which would fundamentally change the way we define a gram. Le Gran K could become a historical curiosity like the original platinum meter stick
posted by dkg
on Mar 2, 2007 -
The wisdom of crowds
and the miracle of aggregation
, arguably, are the reasons why markets
work as well as they do. As New Yorker
James Surowiecki explains in his new book
, "consider the show Who Wants to Be a Millionaire
. When a contestant on the show is stumped by a question, he has a couple of choices in asking for help: the audience or someone he's designated as an expert. The experts do a reasonable job: They get the answer right 65% of the time. But the audience is close to perfect: It gets the answer right 91% of the time, even though it's made up of people who have nothing better to do than sit in a TV studio and watch Regis Philbin." The new, new tipping point?
posted by kliuless
on May 25, 2004 -