Why Explore Space? . Specifically, she asked how he could suggest spending billions of dollars on such a project at a time when so many children were starving on Earth. Stuhlinger soon sent the following letter of explanation to Sister Jucunda, along with a copy of "Earthrise," the iconic photograph of Earth taken in 1968 by astronaut William Anders, from the Moon (also embedded in the transcript). May 6, 1970Dear Sister Mary Jucunda:Your letter was one of many which are reaching me every day, but it has touched me more deeply than all the others because it came so much from the depths of a searching mind and a compassionate heart. The photograph which I enclose with this letter shows a view of our Earth as seen from Apollo 8 when it orbited the moon at Christmas, 1968.
Computer program ‘evolves’ music from noise Evolutionary processes in DarwinTunes. Songs are represented as tree-like structures of code. Each generation starts with 100 songs; however, for clarity, it only follows one-fifth of them. Bioinformaticist Robert MacCallum of Imperial College London and colleagues have adapted DarwinTunes — a program that produces 8-second sequences of randomly generated sounds, or loops, from a database of digital “genes” — to be accessed online. Almost 7000 participants rated each sound loop, played in a random order, on a 5-point scale from “can’t stand it” to “love it.” In a musical take on survival of the fittest, the highest-scored loops went on to pair up with others and replicate. MacCallum and colleagues hope future incarnations will enable up to a million users to log on and participate. Readers can cast their votes at the DarwinTunes Web site. Ref.: Robert M. See also: Triumph of the Cyborg Composer
UV Color Changing Beads at Steve Spangler Science Great Product Review by Andrew I use these beads with my 1st graders to talk about sun safety. During the testing phase, we discovered that some of the beads started to turn a faint color under a lamp with a 100 watt bulb. I thought they only changed colors when exposed to UV light. (Posted on 3/24/14) UV detector! These were great fun! UV color changing beads Review by Wendy K. I love the uv color changing beads. Beads are Great Review by William Using these beads for demonstration purposes. Great fun and great learning! My daughter has been asking for these for 2 years! love.these.beads! My niece, age 7, and nephew, age 4, loved making necklaces then taking them out to see what colors they became! Just OK Review by Ginny S. I used these beads to teach a mini-unit on the power of the sun. Ginny- Oh no! (Posted on 11/12/12) Summer camp must! UV beads are great to show the effects of sun exposure and sunscreen use, especially during a summer camp. Gorgeous colors! Very Sensitive! Thanks. Hi.
Education is Ignorance, by Noam Chomsky (Excerpted from Class Warfare) DAVID BARSAMIAN: One of the heroes of the current right-wing revival... is Adam Smith. You've done some pretty impressive research on Smith that has excavated... a lot of information that's not coming out. You've often quoted him describing the "vile maxim of the masters of mankind: all for ourselves and nothing for other people." NOAM CHOMSKY: I didn't do any research at all on Smith. I just read him. He did give an argument for markets, but the argument was that under conditions of perfect liberty, markets will lead to perfect equality. He also made remarks which ought to be truisms about the way states work. This truism was, a century later, called class analysis, but you don't have to go to Marx to find it. The version of him that's given today is just ridiculous. But even more interesting in some ways was the index. I want to be clear about this. This is true of classical liberalism in general. It's the same when you read Jefferson. CHOMSKY: ... ...
Vivre dans l'espace, le temps d'un après-midi ! / France / ESA in your country Vivre dans l'espace, le temps d'un après-midi ! 18 février 2013 Vous habitez en Ile-de-France ou vous êtes de passage à Paris ce week-end, participez à l'événement "Vivre dans l'Espace à bord de la Station spatiale internationale" avec la participation exceptionnelle de Jean-François Clervoy et Léopold Eyharts, astronautes de l'ESA et de Pamela Melroy, astronaute de la NASA. Organisé par l'ESA, le Club Apollo, la Mairie de Paris 15ème et l'association 3AF, cet événement aura lieu à la Mairie de Paris 15ème, 31 rue Peclet (Métro Vaugirard) le samedi 23 février 2013 de 14h30 à 18hh00. Programme : 14h30 à 16h00 - Salle du Conseil : les jeunes pourront découvrir les métiers de l’aérospatiale avec Gérard Laruelle de l’association 3AF 15h à 16h - Salle St-Lambert : les astronautes accueillent le public pour un libre échange 16h à 18h - Salle des fêtes : conférences des astronautes Jean-François Clervoy, Pamela Melroy et Léopold Eyharts. Entrée libre.
Basics of Space Flight: Orbital Mechanics Orbital mechanics, also called flight mechanics, is the study of the motions of artificial satellites and space vehicles moving under the influence of forces such as gravity, atmospheric drag, thrust, etc. Orbital mechanics is a modern offshoot of celestial mechanics which is the study of the motions of natural celestial bodies such as the moon and planets. The root of orbital mechanics can be traced back to the 17th century when mathematician Isaac Newton (1642-1727) put forward his laws of motion and formulated his law of universal gravitation. The engineering applications of orbital mechanics include ascent trajectories, reentry and landing, rendezvous computations, and lunar and interplanetary trajectories. Conic Sections A conic section, or just conic, is a curve formed by passing a plane through a right circular cone. We can define all conic sections in terms of the eccentricity. Satellite orbits can be any of the four conic sections. Orbital Elements Types Of Orbits 1. . 2R. t)/2.
El Patrón de los Números Primos: Prime Number Patterns by Jason Davies. For each natural number n, we draw a periodic curve starting from the origin, intersecting the x-axis at n and its multiples. The prime numbers are those that have been intersected by only two curves: the prime number itself and one. Below the currently highlighted number, we also show its sum of divisors σ(n), and its aliquot sum s(n) = σ(n) - n, which indicate whether the number is prime, deficient, perfect or abundant. Based on Sobre el patrón de los números primos by Omar E.
Image evolution What is this? A simulated annealing like optimization algorithm, a reimplementation of Roger Alsing's excellent idea. The goal is to get an image represented as a collection of overlapping polygons of various colors and transparencies. We start from random 50 polygons that are invisible. Fitness is a sum of pixel-by-pixel differences from the original image. This implementation is based on Roger Alsing's description, though not on his code. How does it look after some time? 50 polygons (4-vertex) ~15 minutes 644 benefitial mutations 6,120 candidates 88.74% fitness 50 polygons (6-vertex) ~15 minutes 646 benefitial mutations 6,024 candidates 89.04% fitness 50 polygons (10-vertex) ~15 minutes 645 benefitial mutations 5,367 candidates 87.01% fitness 50 polygons (6-vertex) ~45 minutes 1,476 benefitial mutations 23,694 candidates 93.35% fitness 50 polygons (6-vertex) ~60 minutes 1,595 benefitial mutations 28,888 candidates 93.46% fitness Does it work on all images? It depends, success varies.
OBAMA vs ROMNEY: Here's Who's Right About The Economy Une mini arche de Noé pour préparer les vols humains dans lespace Les capsules Bion datent des années 1970, et ont été conçues par l’Agence spatiale russe pour étudier des êtres vivants en apesanteur. Le programme Bion a été arrêté à la fin des années 1990. Il reprend aujourd’hui avec la capsule modernisée Bion-M1 (première capsule modernisée, d’où la dénomination M1). En cas de succès, d’autres vols sont prévus. © TsSKB Progress Une mini arche de Noé pour préparer les vols humains dans l’espace - 2 Photos La semaine dernière, un lanceur russe Soyouz a lancé sept satellites, dont une capsule de recherche récupérable Bion-M avec à son bord une centaine d’organismes vivants différents, ainsi que des graines de plantes. Quelque 80 expériences fournies par divers instituts russes, le Cnes et la Nasa seront réalisées à bord de la capsule Bion-M1. Décollage du lanceur Soyouz 2.1a depuis le cosmodrome de Baïkonour, avec à son bord sept satellites dont le Bion-M1. © TsENKI A voir aussi sur Internet Sur le même sujet