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Threads by latest replies - Page 6

[1375721029] Colonize The Planet Plan

No.56218 View ViewReplyOriginalReport
Plans for Mars permanent base

WASHINGTON - About 40 volunteers from thousands who applied for a one-way ticket to Mars gathered in the US capital to hear from the man behind plans to colonise the Red Planet.

   Dutch entrepreneur Bas Lansdorp plans to establish a permanent base on Mars in a mission he hopes will take off in 2022 if he can get US$6 billion in funds. Nasa has expressed scepticism about the viability of the plan


AGENCE FRANCE-PRESSE

[1381836445] Funny Bone

No.56510 View ViewReplyOriginalReport
TOOTHACHE

   Tooth decay is caused by bacteria that eats the sugar in your mouth. Everyone has *bacteria in their mouths. If these get a supply of sugar from sweet foods, they multiply and a substance called plaque is formed. The bacteria produces acids, which eat into the tooth, forming holes. These holes are called cavities. If the cavity is not filled by the dentist, it reaches the *pulp cavity and causes toothache. An infection may develop or the tooth may become loose if the gum is damaged.

   That is why you should brush your teeth after every meal, if possible. This helps to get rid of sugar and other food that is stuck in your teeth.

   It is also important to visit a dentist regularly. You can prevent cavities and gum disease by eating less sugar. Use a fluoride toothpaste when you brush your teeth as it will strengthen your teeth.

*bacteria - tiny organisms which cause disease.

*pulp cavity - the inner part of the tooth, which contains blood vessels and nerves.
2 posts omitted

[1389340068] Radioisotope source selection

No.56628 View ViewReplyOriginalReport
Hi /sci/,

    I'm planning to assess radioisotopes decay as a random number source.

    The idea is to measure the time between 3 consecutive decay events using a scintillometer or a geiger counter. If the time between event 1 & 2 is smaller than 2&3, send a '1' bit. If the time Btween events 1&2 is greater than 2&3, send a '0' bit. Don't send anything if time is evaluated as equal.

    My current problem is to find an as strong as possible α, β, or β- source (20'000 C/M would be sufficient for my use) which is also a low X & γ ray source, as it is easy to confine the three first types of rays.

    α, β, or β- events should be at least 500 keV to be properly detectable by the detection equipment.

    Once confined (in a 1/4" steel & boron alloy enclosure), the residual exposition MUST NOT exceed 1mSv per year to ensure safety and compliance with regulations.

    Indeed, buying the material should not be subject to excessive red tape, no price limit.

    This said, do you have any ideas of what could be selected for that?

[1389286334] Lawak Cuti Sekolah

No.56627 View ViewReplyOriginalReport
LAWAK CUTI SEKOLAH

PENULIS / PELUKIS : LALANG

Teacher : "Murid-murid semua, bukak buku bahasa Malaysia... halaman lapan. Tajuknya, mari belajar perumpamaan.

Ada sesiapa yang boleh bagikan contoh?"

Student : "Biar saya aje la yang jawab.

'Ibarat ketam mengajar anaknya berjalan lurus' cikgu."

Teacher : "Hoh! Pandai pun kamu Payid. Apa maknanya?"

Student : "Maknanya, orang tak berapa cerdik tapi mengajar orang yang tak cerdik. Macam cikgu la. Cikgu ni cerdik ke tak ni? Yang suruh saya datang sekolah time cuti sekolah ni apsal?"

Teacher : "Ooo.. cuti ke? Patut la ko sorang je yang datang sekolah."

LaLang

[1375297684] Stocks

No.56142 View ViewReplyOriginalReport
What do you guys know about prime numbers and predicting stock market movement?
10 posts omitted

[1383844183] Rocket

No.56553 View ViewReplyOriginalReport
Rocket over roti

MISSION TO MARS

MANGALYAAN Mars spacecraft

Lyman Alpha Photometer: To study relative abundance of hydrogen and deuterium in Mars' upper atmosphere

Medium gain antenna

Methane sensor: Measures gas in Mars' atmosphere and map its source

Exospheric Neutral Composition Analyser: To study Martian atmosphere

Colour camera: To beam images and data on surface features and composition of Mars, also to probe Martian satellites, Phobos and Deimos

Thermal infrared imaging Spectrometer: To map surface composition and minerology

High gain antenna

Launcher: Polar Satellite Launch Vehicle XL, 45m

Launch weight: 1,350kg

Launch site: Satish Daiwan Space Centre, Sriharikota, India

MISSION: To study the Martian surface and its mineral composition. Search for methane in Mars' atmosphere.

BLAST OFF: The satellite launch vehicle carrying the Mars orbiter blasting off from Sriharikota.

READY TO GO: Scientists working on the Mars orbiter vehicle at the Indian Space Research Organisation's satellite centre in Bangalore.

Indian security personnel standing guard inside the control station before the launch of India's Polar Satellite Launch Vehicle, carrying the Mars orbiter, at Satish Dhawan Space Centre in Sriharikota.

Technical staff standing next to satellite launch vehicle before its launch from the Satish Dhawan Space Centre in Sriharikota.

India's mission to orbit Mars, launched successfully on Tuesday, re-ignites the long-standing debate on whether the money could be better spent on the poor

India's sky-high ambition to be a world space power turns a blind eye to its down-to-earth problems.

   That is what critics of India's Mars Orbiter Mission, which took off from Sriharikota in Andhra Pradesh on Tuesday, are saying.

   "I think it's so strongly symbolic of an extremely unequal society," Mr Harsh Mander, director of New Delhi's Center for Equity Studies and a former adviser to Prime Minister Manmohan Singh on social issues, told the Los Angeles Times.

   "We continue to have something like 230 million people who sleep hungry every night, and millions die because they can't afford healthcare. Yet these are not issues that cause outrage."

   Prominent scholar and economist-activist Jean Dreze, who had conceptualised and drafted the first version of MNREGA - a rural aid scheme - is critical of the mission to orbit Mars, maintaining that it "seems to be part of the Indian elite's delusional quest for superpower status".

   Mr Jason Burke, writing for The Guardian, also questioned the purpose of the mission.

   He said: "A plunging currency, ailing economy and the state's seeming inability to deliver basic services have led many Indians to question whether their nation is quite as close to becoming a global superpower as it seemed in the heady years of the last decade, when economic growth pushed the 10 per cent (mark)." But scientists have defended the flight.

   They said that it costs only a little more than 6 US cents per capita in a nation with a population of 1.2 billion, roughly the same as an aircraft, and brings pride to the country, reported The Los Angeles Times.

   "There are social benefits", including weather satellites that save lives, Mr Ajey Lele, a research fellow with the Institute for Defence Studies and Analyses, a think tank, told the newspaper.

   It will also promote the capability and affordability of India's commercial satellite-launching service. So far, India had launched 35 satellites for other countries, Mr Lele said, and is eager to do more.

   A top government official told the BBC the arguments against rocket launches are not new.

   He said: "We have heard these arguments since the 1960s, about India being a poor country not needing or affording a space programme. If we can't dare to dream big it would leave us as hewers of wood and drawers of water! India is today too big to be just living on the fringes of high technology."

   Yesterday, the spacecraft completed its first stage. The launch vehicle will now stay in Earth's orbit for nearly a month, building speed to break free from our planet's gravitational pull, reported NDTV.

   It will then begin the second stage of its nine-month journey to orbit Mars.

BY THE NUMBERS

US$73 million India's Mars Orbiter Mission

US$2.5 billion Nasa's Mars Curiosity mission in 2012

US$671 million Nasa's upcoming Mars Maven satellite

US$1.5 billion Nasa's 2020 Mars rover

SOURCE: WALL STREET JOURNAL/LOS ANGELES TIMES

SOURCE: REUTERS, INDIAN SPACE RESEARCH ORGANISATION, THE TIMES OF INDIA

ADAPTED FROM REUTERS

[1226063680] Newton's Laws Problem

No.38822 View ViewReplyOriginalReport
Two boxes are side by side on a frictionless surface. A horizontal force is applied to move both boes.
(b) Determine the force that the 3.0 X 10¹ kg box applies to the 2.0 X 10¹ kg box.

[1381824981] Science Crazy

No.56509 View ViewReplyOriginalReport
ELECTRIC LEMON

Oh, no! That man's just been electrocuted by a lemon! Heh, heh! I was just joking, of course, but have you ever wondered how people get all that electricity into a little battery? Amazing, isn't it? Well, you can get electricity from a lemon too! This is what you'll need...

A lemon (of course!)

A galvanised steel nail

Plastic-coated wire

Copper wire

A compass

1. Press the lemon hard on the table so that it's juicy inside.

2. Get an adult to help you to strip the ends of the plastic-coated wire.

3. Twist one of the bared ends of the wire around the copper wire. Push the copper wire into the lemon.

4. Wrap part of the wire around the compass. Wind the other bare end of the wire around the galvanised nail. Push the nail into the lemon. Does the needle of the compass move?

THE WHYS AND WHEREFORES

Electricity, put simply, is the movement of tiny particles called electrons. A battery has to have three parts: a source of electrons, a place for the electrons to go, and something to carry the electrons from one place to the other. In the lemon battery, the iron nail gives out electrons, which move along the insulated wire to the copper wire. Since electricity has a magnetic field, it causes the compass' needle to move.

[1387823882] Representativeness

No.56607 View ViewReplyOriginalReport
I came up with this today.

You could say a theory is x% representative, which you get by dividing the number of cases where it works by the number of all possible cases.

For example, take a function F(a,b) which behaves as a logical OR. The theory that it behaves as a logical AND is then 50% representative: it works for (0,0) and (1,1) (2 cases) and fails for everything else (there being a total of 4 possible cases).

[1386870079] What's So Funny?

No.56595 View ViewReplyOriginalReport
What's so funny?

In 1975, Mr Alex Mitchell, a 50-year-old bricklayer from King's Lynn, England, died laughing after watching an episode of the BBC television comedy series, The Goodies.

   The incident was widely reported in the British press.

   Around the same time, my father told me the following joke.

   A man went to the doctor and said: "Doctor, I get a pain in my eye every time I drink tea."

   The doctor replied: "Then take the spoon out of the cup."

   I remember laughing so hard that I could hardly breathe - though, thankfully, I lived to tell the tale.

   Later, I shared the joke with my friends, but was surprised to find that none of them found it nearly as funny as I had.

THE WORLD'S FUNNIEST JOKE

This set me wondering if there was a joke so hilarious that it would make everyone laugh.

   If so - and if I could find out what it was - then I could tell it to my school friends and create a sensation.

   I turned to the Guinness Book Of World Records, but was disappointed to discover that there was no entry for "funniest joke".

   My comedic hopes were dashed.

   Imagine my delight, then, when I recently stumbled upon psychologist Richard Wiseman's 2007 book Quirkology, and learnt that he had once conducted a year-long scientific search for the world's funniest joke.

   In 2001, Dr Wiseman and his team of researchers set up a website where people from around the globe could enter a few details about themselves, submit their favourite jokes and rate jokes submitted by others.

   Altogether, more than 40,000 jokes were collected and rated.

   Most jokes barely raised a chuckle.

   A minority were funny enough to get a thumbs-up from more than 25 per cent of reviewers.

   A mere handful achieved an approval rating above 50 per cent.

   And even the very top joke was considered funny by only 55 per cent of those who took part in the experiment.

   So much for my childhood dream.

   Dr Wiseman's research failed to unearth a single joke that had universal appeal.

   Instead, it showed that different jokes appeal to different people.

   Women, for example, laugh at jokes in which men appear stupid, whereas men prefer jokes that poke fun at women.

FEELING SUPERIOR

During the course of his research, Dr Wiseman discovered something interesting.

   All of the top jokes had something in common - they created a sense of superiority in the reader.

   Here are two examples.

   A teacher decided to take her bad mood out on her class of children, and so, said: "Everyone who thinks he's stupid, stand up!"

   After a few seconds, just one child slowly stood up.

   The teacher turned to the child and said: "Do you think you're stupid?"

   "No," replied the child, "But I hate to see you standing there all by yourself."

   And have you heard about the man who was proud when he completed a jigsaw within 30 minutes because it said "five to six years" on the box?

   In the first joke, a pompous teacher is taken down a peg or two and, in the second joke, a man is shown to be outrageously stupid.

   In both cases, the reader gets to feel smugly superior.

   The idea that laughter is most often prompted by situations that allow us to feel superior is not a new one.

   Greek philosopher Plato made the link more than 2,000 years ago.

   Dr Wiseman's research suggests that Plato got it right.

   And, if you think about it, it makes sense.

   Everyone has anxieties and insecurities.

   Everyone worries about his status.

   So it is not surprising that people find comic relief in jokes about others' inadequacies and misfortunes.

   If you would like to read the top-rated joke from Dr Wiseman's study, check out: http://richardwiseman.wordpress.com/books/psychology-of-humour