My PhD: http://www.physics.usyd.edu.au..../super/theses/PhD(Mu
It is a common view that "if only someone could break this down and explain it clearly enough, more students would understand." Khan Academy is a great example of this approach with its clear, concise videos on science. However it is debatable whether they really work. Research has shown that these types of videos may be positively received by students. They feel like they are learning and become more confident in their answers, but tests reveal they haven't learned anything. The apparent reason for the discrepancy is misconceptions. Students have existing ideas about scientific phenomena before viewing a video. If the video presents scientific concepts in a clear, well illustrated way, students believe they are learning but they do not engage with the media on a deep enough level to realize that what was is presented differs from their prior knowledge. There is hope, however. Presenting students' common misconceptions in a video alongside the scientific concepts has been shown to increase learning by increasing the amount of mental effort students expend while watching it.

How Schlieren imaging works in color, black and white and slow-mo.
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Filming by Raquel Nuno
Sound Effects by A Shell in the Pit

The Nobel Prize for physics in 2011 was awarded to Brian Schmidt, Adam Riess, and Saul Perlmutter for discovering that the universe is expanding at an accelerating rate. This finding was completely unexpected because it was thought that gravity should slow the expansion of the cosmos. The best current explanation of why the universe is accelerating is that there is some energy tied to empty space which pushes matter apart. This 'Dark Energy' makes up 73% of the universe but is very difficult to detect. Hopefully a better understanding of it will lead to a unification of our theories of gravitation and quantum mechanics.

Images courtesy of NASA - NASAimages.org

I used a nitrogen membrane and Stirling cryocooler to liquefy nitrogen out of the air. For this video I partnered with Starbucks to celebrate their Nitro Cold Brew. Order one here: https://starbucks.app.link/derekmuller

Making liquid nitrogen is hard - in fact up until 150 years ago scientists doubted whether it was even possible to liquefy nitrogen. In 1823, At the royal institution in London, Michael Faraday first produced liquid chlorine, kind of accidentally by putting it under high pressure. He similarly liquefied ammonia.

Borrowing a mixture from Thilorier in France, a combination of dry ice, snow and ether, he reached a temperature of -110C. By 1845 he used this mixture plus a hand pump to pressurize gases to liquefy all the known gases except six, which included oxygen and nitrogen. These became known as the “permanent” gases.

A French Physicist Aimé compressed oxygen and nitrogen in tanks and then lowered them into the ocean over 1.6km deep, where the pressure got up to 200 atmospheres. Still the gases didn’t liquefy.

Only at the end of 1877 were the first droplets of liquid oxygen and liquid nitrogen produced, by Cailletet in France. He first tried oxygen by compressing it up to 300 atmospheres, cooled to -30C, but that wasn't even enough to liquefy oxygen. But when he suddenly released the pressure, the expanding gas cooled, he estimated to -200C and he saw a mist and then droplets slide down the walls of his vessel.

It's amazing how far we've come in that now I can purchase a helium-based cryocooler. It compresses and expands the gas to absorb heat from the tip of the cold finger and eject it into the surroundings at ambient temperature.

Right: https://www.youtube.com/watch?v=AS9OXzSRBMQ
Left: http://www.youtube.com/watch?v=FWQ-HJ4oGKQ
It Depends: https://www.youtube.com/watch?v=R3GHiMOHEy8
What happens when nylon rope is wound around a spool and pulled horizontally to the right? Will the spool go to the right, to the left, or does it depend on how the rope is pulled?

As a Canadian-Australian, I have always wondered why it is that Australia has so many venomous animals that can kill you while Canada has virtually none.
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But it's not just Australia - it seems like all beautiful, warm places are cursed with venomous native species. So I set out to find the truth: why have all these venomous species evolved in the world's best holiday destinations?

I asked chemists, visited the zoo, interviewed entomologists and snake experts. The answer I found was complicated:
1. The majority of venomous species are ectotherms, cold-blooded creatures whose internal temperatures are governed by their surroundings.
2. This means they have limited periods of activity - mainly while it's warm out, and can only exert short bursts of energy, so they are generally "sit and wait" predators. This may explain why they, more than mammals or birds, evolved venom.
3. It also explains why there are more of these species in warm climates. There are more of all species in warm climates, but this trend is especially pronounced for ectotherms.
4. So there are a greater number of venomous species in warm places, simply because there are more species in warm places. Cold climates still have venomous creatures, like the rattlesnakes of Canada and European vipers.
5. But history also has a role to play. In Australia, there were no snakes until 20 million years ago when a venomous sea snake from Asia encountered the land, sending venomous species to all corners of the continent. Later non-venomous arrivals have done well in the tropics but not as well in Australia's colder climates, so venomous types still dominate there. Hawaii has no venomous land snakes and nor does Jamaica.
6. The recent ice age also would have driven ectotherms from the northern parts of the Northern Hemisphere. This is why there are no snakes in Ireland, for example.

Special thanks to Prof. Rick Shine, Prof. Dieter Hochuli, Prof. Roger Lowe, Prof. Martyn Poliakoff and Taronga Zoo, especially Joe Haddock and Dean Purcell.

Cinematography by Charles Clement

Strange flying objects have been caught on NASA’s cameras and astronauts have reported seeing UFOs. Some can be identified; others remain a mystery. We’ll reveal NASA footage and interview the astronauts and scientists.

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Get ready for liftoff to the Sun! ?

Solar Orbiter, a collaboration between European Space Agency and NASA, is launching Sunday, Feb. 9, to study the inner workings of our nearest star. Tune in for launch coverage starting at 10:30 p.m. on Sunday, Feb. 9 to see liftoff, currently targeted for 11:03 p.m. EST.

More info: https://go.nasa.gov/2SiKpNn

Aboard the International Space Station, Expedition 62 Flight Engineer Jessica Meir of NASA discussed the revolutionary Zero-G oven recently used on the orbital outpost during an in-flight question and answer session Feb. 19 with students from the East Middle School in Grand Blanc, Michigan. The oven was launched on a Northrop Grumman Cygnus cargo ship last November, and, along with cookies baked in the oven, was returned to Earth in January on a SpaceX/Dragon resupply vehicle.

On Monday, Jan. 20 starting at 6:50 a.m. EST, NASA astronauts Jessica Meir and Christina Koch will step outside of the International Space Station into the vacuum of space together. The duo will wrap up the work of installing new lithium-ion batteries to upgrade the orbiting lab’s power systems. The spacewalk is scheduled to last about six-and-a-half hours.

Band:
Mike X. Zuniga- (MD)Bass
Aldo Juarez- Drums
Chris Rocha- Guitar
Robert Prado- Guitar
William ''Willie'' Garcia- Keys
Jamie Arroyo- Keys

Buenos Amigos

Que importante es rodearnos de personas correctas a las que podamos escuchar, con las que podamos ser honestas y platicar cuando estamos en necesidad.
Cuantas veces somos muy prontos para ver los errores de los demas pero batallamos en ver los nuestros.
Dios quiere ayudarnos a rodearnos de amistades correctas que nos den buenos consejos, que nos ayuden a crecer, cumplir su propósito y a ser mejores personas.

Síguenos en:

Facebook:https://www.facebook.com/marcelagandaraoficial
Twitter: https://twitter.com/marcela_gandara/
Instagram: https://www.instagram.com/marcela_gandara/
Escucha nuestra musica en:
http://hyperurl.co/phn505

Creditos:
Producción y edición de video: Dauny Chilin
Coordinación: Betza Burruel

espero q le guste, suscriban-se

Julio Melgar & Marcela Gandara
Tema: Creo en Ti
Álbum: Soluciones Live
#JulioMelgar #MarcelaGandara

Predicación #EnVivo desde el Tabernáculo Bíblico Bautista en El Salvador.

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▂ ▃ ▄ ▅ ▆ ▇ █ SUSCRIBETE Y COMENTA █ ▇ ▆ ▅ ▄ ▃ ▂
SUBO VÍDEOS TODOS LOS MIÉRCOLES Y VIERNES ,ACTIVA LA CAMPANA PARA SABER CUANDO SUBO VIDEO ,SI ESTAS ACTIVO EN LOS COMENTARIOS ,SERAS SALUDADO EN EL PRÓXIMO VÍDEO

--------------------------------------------------------
LETRA:

Yo tengo un nuevo amor, el corazón me late sin parar, hay uno que
Me ha dicho te
Te amo de verdad, jesús mi amor y mas que amor mi dulce paz.
Yo tengo un nuevo amor jamas imagine poder hallar, aquel que le
Dio a mi vida
Una razón para amar, jesús mi amor y más que amor mi dulce paz.

Siento que tengo ganas de volar al firmamento, gritarle al mundo
Entero lo que
Estoy sintiendo, que ya encontré mi dulce amor, jesús es toda mi
Verdad, y nunca
Yo me cansare de repetir hasta el final.

Yo tengo un nuevo amor, el corazón me late sin parar, hay uno
Que me ha dicho te
Te amo de verdad, jesús mi amor y más que amor mi dulce paz.
Yo tengo un nuevo amor jamas imagine poder hallar, aquel que le
Dio a mi vida
Una razón para amar, jesús mi amor y más que amor mi dulce paz.

Amo su voz dulcísima en respuesta cuando llamo, sus ojos tiernos
Hasta el toque de
Sus manos, por siempre suyo quiero ser, jesús es toda mi verdad
Y nunca yo me
Cansare de repetir hasta el final.
--------------------------------------------
Le doy primero las gracias a Dios por verme dado estos talentos que quiero compartir con ustedes ,Espero que les guste y sea de bendición are lo posible para mejorar ,DIOS LES BENDIGA ,BIENVENIDOS A DAVID TUTORIALES
-----------------------------SUSCRIBETE Y COMPARTE-----------------------------
DAVID TUTORIALES

CANALES AMIGOS :VISITALOS

NANCY MORALES LONDOÑO;
https://www.youtube.com/channe....l/UCrG9AnINcmbuL1JVs

EDWIN TUTORIALES EN PIANO :
https://www.youtube.com/channe....l/UCk-fsZi7cxj1L2idi

Johan ValenciaD:
https://www.youtube.com/channe....l/UCRpzJG_CSqLm2VKcQ

Jaci Velasquez
Myrrh Records/Sony Discos - 1999

Tears For Fears - Sowing The Seeds Of Love (Disco Tears Roll Down Greatest Hits 82 92 2003)

Tears for Fears - Laid so low tears roll down

Chewed the bone down too low
Got fed on tea and sympathy
Blew the sail like the wind
I wish you were my enemy

I was humble for you
What a fool I've been to have
Laid so low (so low)
For so long (so long)
So low (so low)

Into that void of silence
Where we cry without sound
Where tears roll down
Where tears roll down
And when your mother's violence
Sent your soul underground
Where tears roll down
Where tears roll down

Drew the blade way, too slow
Was shackled by your honesty
Made a mess, I guess I
Should have known
The life was lust and liberty

Not a chance mutation
Or the last temptation
Laid so low (so low)
For so long (so long)
So low (so low)

Into that void of silence
Where we cry without sound
Where tears roll down
Where tears roll down
And when your mother's violence
Sent your soul underground
Where tears roll down
Where tears roll down

Into that void of silence
Where we cry without sound
Where tears roll down
Where tears roll down
And when your mother's violence
Sent your soul underground
Where tears roll down
Where tears roll down


Tradução:

Tears for Fears - Humilhado

Roí o osso até o fim
Fui alimentado com chá e piedade
Soprei a vela como o vento
Eu gostaria que você fosse minha inimiga

Eu fui humilde por você
Que tolo eu fui
Por ter me humilhado tanto
Por tanto tempo
Tanto

naquele vazio de silêncio
Onde choramos sem som
Onde as lágrimas caem
Onde as lágrimas caem
E quando a violência da sua mãe
Mandou sua alma para debaixo da terra
Onde as lágrimas caem
Onde as lágrimas caem

Puxei a lâmina de um modo lento demais
Fui tolhido pela sua honestidade
Fiz uma bagunça, eu acho que eu
Deveria saber
Que a vida era luxúria e liberdade

Não uma mutação casual
Ou a última tentação
Humilhado tanto
Por tanto tempo
Tanto

Naquele vazio de silêncio
Onde choramos sem som
Onde as lágrimas caem
Onde as lágrimas caem
E quando a violência da sua mãe
Mandou sua alma para debaixo da terra
Onde as lágrimas caem
Onde as lágrimas caem

Naquele vazio de silêncio
Onde choramos sem som
Onde as lágrimas caem
Onde as lágrimas caem
E quando a violência da sua mãe
Mandou sua alma para debaixo da terra
Onde as lágrimas caem
Onde as lágrimas caem


.