From the MIT news office:
It's a bug's
life: MIT team tells moving tale. This is news of David Hu's
thesis on
meniscus-climbing
insects. You can't swim or climb up a meniscus by normal means,
it being near-frictionless, so these insects neatly create their own
local meniscus and propel themselves by the resultant inter-meniscus
forces.
This is an oldish story, but worth
reading anyway:
The
Throat Singers of Tuva, a September 1999
Scientific
American piece on the singing technique of 'overtoning' -
generating dual pitches by resonance harmonics in the vocal tract.
If you have popups blocked, here's the sidebar linking to
sound
samples;
this
track by master throat-singer Kaigal-ool Khovalyg is especially
impressive. There are many other sites on the topic - far too many,
unfortunately, latching on to it as a New Age scam by those claiming
therapeutic value to singing weird noises at you. But
Kiva's site, one
of the sensible ones, is worth checking out for its good set of
links for
musical practitioners, such as Michael Emory's
Khoomei - How To's And
Why's which explains how to do it. More tips and technical
background at
Khoomei.com. Another
site,
Friends of
Tuva, leads off in unexpected directions. The late Richard
Feynman having collected Tuvan stamps, the site segues to
How bent spaghetti
break, the solution of a problem that stumped Feynman. Do try it
at home: it's surprising.
Occasionally I'm blown away by
people's ingenuity. I'm not a great folllower of Flickr, but Dave
Mitchell just sent me a link to a lovely photo set of Topsham (where
I live) taken over the last couple of days: aerial shots using a
kite-mounted radio-controlled camera.
Here
is the Topsham set; here's the
KAP
(Kite Aerial Photography) equipment. His
Flickr
contributions (49 currently) also include aerial shots of his
home town of Totnes.
From
Eurakalert,
New
trigonometry is a sign of the times: a press release about the
new 'rational trigonometry' system devised by
Dr Norman
Wildberger, Associate Professor in mathematics at the University
of New South Wales.
The
system is a geometry based not on distance and angle, but on
"quadrance" (square of distance) and "spread" (sine-squared of
angle), enabling analytical geometry to be handled by simple algebra
without irrational and transcendental terms. Unlike Euclid, it's
rooted in Cartesian geometry, taking core definitions of a point as
an ordered pair (x,y) and a line as a linear
equation.
At a first glance,
I'm fairly sceptical. It pitches straight at those for whom
trigonometry was a bugbear at school, with the result that it's
being widely blogged with little analysis of the specifics -
particularly that the dimensionless "spread" is itself a trig
function (a detail that none of the PR
mentions).
Another detail not
mentioned is that its basic laws all appear to be recast forms of
standard trig formulae. One is credited as based on Pythagoras'
theorem:
a^2 = b^2 + c^2 becomes an expression in quadrances
Q1 = Q2 + Q3. But the Spread Law and Cross Law are uncredited
as equivalents of the sine and cosine rules, and the Triple Quad
Formula for collinearity as an equivalent of Heron's formula (three
points are collinear if they make a triangle of zero
area).
In short, it's not an
entirely new geometry, but the old one put in terms of transformed
variables. Moving distance/angle to this quadrance/spread domain
does look a potentially useful transformation for some tasks, and
makes some equations simpler. But there's a major tradeoff: as
derived quantities, quadrance and spread don't add linearly like
distance and angle. For instance, the equivalent of adding two
angles
a1+a2 is a nonlinear function of the corresponding
spreads s1 and s2, given by
2*sqrt(s1*s2*(1-s1)*(1-s2))-2*s1*s2+s1+s2 There's
a forthcoming self-published book,
Divine Proportions: Rational
Trigonometry to Universal Geometry. Judging by the
preview page, which also
has PDFs of introductory material and the
first
chapter, I doubt if it'll change established analytical
geometry. But it still looks interesting reading for maths
enthusiasts.
Addendum: There's some good-quality
discussion of the pros and cons at
PhysOrgForum.
The suburbs tend to attract derision
as a repository of conformity, but in the UK at least, their growth
is a significant episode in social history.
Ideal Homes:
Suburbia in Focus is an interesting University of Greenwich
project to document that history for south-east London, exploring
the complex factors behind their growth (
Why
suburbs happen).
The
inter-war boom was one notable phase; though newly-created suburbs
were promoted to buyers as idyllic and offered an escape from
inner-city slums, their growth was often udnerpinned by shoddy
practices. One notable case was that of the Coney Hall estate, where
Jim and Elsy Borders led a mortgage strike in 1937 in protest
against the poor building quality. There's very little about them on
the Web, except for this cache of "The Mortgage Strikes (Elsy and
Jim Borders 1939 battle against the building societies)",
History
Today, June, 2001, by Andrew McCulloch: (
Part
1 /
2
/
3).
They're mentioned briefly in Alan Crisp's M.Litt Oxford thesis
The working-class
owner-occupied house of the 1930s.
The
end of Life as we know it:
Guardian editor Alan
Rusbridger on the future of the Guardian's science coverage. The
weekly
Guardian science section, Life, is to be scrapped and
replaced by a daily science page. "The page will continue to publish
some of Life's most popular features" - at least
Bad Science will stay -
"but will also enable us to be more responsive to the daily news and
explain the science behind events and issues, some of which may, on
first sight, appear to have little connection with
science".
I'm not convinced
this is a good idea; it'll mean the end of double-page in-depth
science articles, one of which appeared in the concluding issue of
Life:
Don't
dumb me down, Ben Goldacre's indictment of media coverage of
science stories. He argues that science coverage is still plagued by
distortion and innaccuracy, due to being filtered through the
stereotyped perceptions of non-scientists in the media hierarchy.