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Help link 27/04/2003; 16.46.15.


sabato 1 marzo 2003
 

Ma è proprio vero che due fiocchi di neve non possono essere proprio uguali?

La risposta è: Dipende

Snowflake Photos [Slashdot]

cristallo di neve
3:06:10 PM      comment []

Siccome si sta cominciando a parlare di queste cose, e tipicamente chi va in televisione a parlarne ne ha una comprensione piuttosto superficiale, dò data certa a questa riflessione, per poter dire in futuro "io l'avevo detto".

Nei laboratori americani qualcuno cerca di avere finanziamenti proponendo armi nucleari da usare contro i bunker di un ipotetico dittatore. Si dice allegramente che la bomba, scoppiando sottoterra, avrebbe un effetto limitato alla superficie (guardate questa figura).

Peccato che non sia vero. Una bomba nucleare anche piccola (1KT, un quindicesimo della bomba di Hiroshima) deve essere almeno un paio di centinaia di metri sottoterra per non creare un fallout letale.  Le prove sono state fatte negli anni '60 quando si pensava di usare esplosivi nucleari per scavare buchi.

E' possibile costruire un missile che spinge un'arma nucleare così in profondità da contenere l'esplosione?

No.

Given these constraints, it is simply not possible for a kinetic energy weapon to penetrate deeply enough into the earth to contain a nuclear explosionNuclear bunker busters come under scrutiny [New Scientist]


3:01:49 PM      comment []

Le cose non sono mai come sembrano, pare. Ieri sera sono andato a una cena con gli amici del calcio. Il mio amico e allenatore Valerio ("Barbas") raccontava del suo viaggio in Egitto. Non so bene se fosse a Hurgada o in un posto del genere, a godersi il sole, quando ha visto un capannello di gente, una trentina di persone.

Chiedendo a un vicino che parlava l'italiano (o lingua similare) questo gli ha detto che c'era Gheddafi.

"Come Gheddafi, in mezzo a una strada, in mezzo alla gente?"
E l'egiziano: "Certo, lui non è mica come Mubarak, la gente gli vuole bene"
Barbas già pensava di essere preso per i fondelli quando il gruppetto si apre e:
"Pensa te, l'ho visto, il Ghedda a non più di tre metri da me, che parlava con sti egiziani tutti sorridenti che gli davano pacche sulle spalle. Stavo quasi per dirgli 'Bela Ghedda!' poi mi sono trattenuto. "

Non so cosa significhi, di certo che le cose non sono come ci aspettiamo. La nostra idea del Ghedda è quella di un dittatore sanguinario, che tiene sotto il tallone di ferro i suoi sudditi, non dorme mai due volte nello stesso posto e non si fa mai vedere in pubblico.  

Pensate, non dico G Dabeliu, non dico il nano, ma il sindaco di una grande città, o un ministro o un qualunque vip, che si mescola alla gente, in pubblico, senza particolare pompa, senza stare dietro i vetri di una macchina blindata.

Mi sembra che ci sia qualcosa che non capiamo. E i nostri alleati, noi, stanno per fare una guerra contro gente che non capiamo. Potrebbero succedere cose brutte.


10:38:52 AM      comment []


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