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Education

Khan Academy Delivers 100,000 Lectures Daily 213

eldavojohn writes "Working from the comfort of his home, Salman Khan has made available more than 1,500 mini-lectures to educate the world. Subjects range from math and physics to finance, biology, and current economics. Kahn Academy amounts to little more than a YouTube channel and one very devoted man. He is trying to provide education in the way he wished he had been taught. With more than 100,000 video views a day, the man is making a difference for many students. In his FAQ he explains how he knows he is being effective. What will probably ensure his popularity (and provide a legacy surpassing that of most highly paid educators) is that everything is licensed under Creative Commons 3.0. He only needs his time, a $200 Camtasia Recorder, an $80 Wacom Bamboo Tablet, and a free copy of SmoothDraw3. While the lecturing may not be quite up to the Feynman level, it's a great augmenter for advanced learners, and a lifeline for those without much access to learning resources."

Comment Re:The Science Gap is a Myth (Score 1) 618

It seems to me most of the of the people who complain about the "science gap" are those who aren't actually working in the field...

Isn't that how it should be? Why would the haves complain? It's always the have-nots who have to complain about any inequality, not the people who are sitting in their Porsches and expensive mansions.

The topic is people aren't finding enough science jobs. OMG, there are some people out there *with* science jobs who aren't complaining! I never would have thought! :D

That's a "let them eat cake" reply if I ever saw one. :D

Comment Re:Good point by the Bad Astronomer (Score 2, Insightful) 56

I'm a little skeptical of this claim.

Can you elaborate on how the heat generated by the large asteroid (at ground level on impact) somehow ends up radiating off into space, yet the same heat generated higher up in the sky when the bits burn up in re-entry (closer to space) somehow doesn't end up radiating off into space?

As I see it, breaking up an asteroid allows us to convert the kinetic energy to heat higher up in the sky (and closer to space) than a ground level impact would be.

Do you have some links I could read up on?

Comment Re:Pointless (Score 2, Insightful) 152

It's not about laziness. If it was about laziness, I'd jump on the new tech because it saves me the "arduous" step of *plugging in* (gasp). Instead I'm planning on staying with the far more demanding step of actually plugging in.

It's about forgetfulness. As I grow older and more senile, I plain and simple don't *remember* to put my devices at their designated charging locations every single night. If there was a tech that charged my devices no matter where I left them inside the confines of my house, that would something that would produce a useful value add for me.

Eliminating the plugging in phase does not produce a useful value add because I'm not so lazy that plugging in is some huge obstacle.

Comment Pointless (Score 4, Insightful) 152

I don't really see the point. As long as you have to put the device in a specific location anyway, I don't see that it's much of an improvement over having to connect it with your charger. You have to connect it with a location just the same, with this new tech, just the plug is different (a pad vs a plug).

Wake me when you have a tech that charges my mobile from the moment I step in my home door and leave my mobile in my jacket pocket hanging in the foyer.

Until that use case can be satisfied, I think this is just the same-old, same-old.

Education

Students Take Pictures From Space On $150 Budget 215

An anonymous reader writes "Two MIT students have successfully photographed the earth from space on a strikingly low budget of $148. Perhaps more significantly, they managed to accomplish this feat using components available off-the-shelf to the average layperson, opening the door for a new generation of amateur space enthusiasts. The pair plan to launch again soon and hope that their achievements will inspire teachers and students to pursue similar endeavors."

Comment Re:How can you... (Score 1) 452

A rocket engine is a pretty specialized piece of hardware, and without any major world wars going on, who's going to invest in advancing the technology for faster rockets? The airline industry is in dire straits as it is, it's not exactly going to be developing rocket jetliners anytime soon.

So I don't really see which of currently researched techs could make the rocket engine cheaper. I'd like to hear your thoughts on which of the technologies you mentioned (or any others) look likely to produce a better rocket engine?

Comment Re:How can you... (Score 5, Insightful) 452

We could simply defer manned space exploration until such time as it becomes less expensive

What makes you assume such time will come without investing in it?

You're suggesting just sitting on our asses and hoping some magical tech will just materialize that will make everything just teddy bears and rainbows.

Comment Re:Baseline shuttle extension (Score 2, Informative) 452

Note that a space station orbiting the Moon is also easier to reach from Earth than one in a LP.

Actually no, it's not. They both have the same delta-v requirement.

http://en.wikipedia.org/wiki/Delta-v_budget

From LEO to lunar orbit is 4.1 km/s.

From LEO to L4/5 is *also* 4.1 km/s.

I imagine it's actually cheaper to go to the L-point on the line between Earth and Moon but it's less interesting than 4-5 IMO.

Comment Re:Baseline shuttle extension (Score 1) 452

Until someone can come up with that "something better" than ion/chemical rockets, this is the only road available to us.

Travel with us on it, or don't.

We fully understand how massive an operation manufacturing is. That's why we need to get started *now* so we can get something built someday.

We either do something with what we tangibly, actually have, or we sit down and dream about, "oh, we could do so much if only we had MacGuffin so-and-so".

Comment Re:Baseline shuttle extension (Score 1) 452

However, propellants can be mined in space instead of exported from the very expensive Earth gravity well. Hence, a mining station. I know I said "smelting", but I didn't mean an exclusively metal processing yard. NEOs have volatiles too, and they can be mined and processed into fuel without needing to import volatiles from Earth. So, a station at L4 that mines both volatiles and metals, would be invaluable to space exploration.

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