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Comment IOMMU (Score 4, Informative) 125

Yes, when I saw this I thought that this was a reason to make motherboard IOMMUs a security feature. Also, the DMA destination memory pages should not have the executable bit turned on. Recent generations of Intel/AMD CPUs have provided the ability to turn that bit off.

Comment Can't replicate (Score 4, Informative) 135

I can't replicate it either. The YouTube video claims I double-tap the home button but the second tap is slightly longer? By the end of the first tap it's already bringing me back to the lock screen, i.e. by the time I'm pressing down for the second tap, I'm already being taken back to the lock screen. iPhone 5, updated last night to 7.0 (11A465).

Submission + - Another Climate-Change Retraction (thinkprogress.org)

jamie writes: It seems every time someone twists global-warming science into 'good news,' a retraction is soon to follow, and so it must be for Slashdot. Yesterday, the conservative Wall Street Journal published yet another apologetic claiming "the overall effect of climate change will be positive," by someone who (of course) is not a climate scientist. Today, Climate Progress debunks the piece, noting 'Ridley and the WSJ cite the University of Illinois paper to supposedly prove that warming this century will be under 2C — when the author has already explained to them that his research shows the exact opposite!' We went through this same process last year, with the same author and the same paper, so it's pretty embarrassing that he 'makes a nearly identical blunder' all over again.

Submission + - Gore Misquoted on Hexametric Hurricanes (washingtonpost.com)

jamie writes: In a story on Thursday, Slashdot and its readers had a little fun at the expense of Al Gore, who was quoted as saying that the hurricane severity scale was going to go to 6. A correction was made the next day. The author of the piece that Slashdot linked now writes "I retract the balance of my criticism." Turns out Gore was misquoted.

Luckily for Gore, this is the first time he's been ridiculed for something he didn't actually say. Well, except for Love Story, Love Canal, farm chores, and everyone's favorite, inventing the internet.

(The original Slashdot story is at http://yro.slashdot.org/story/13/08/22/2111247/for-overstated-claims-gore-tesla-upbraided-by-nws-nhtsa-respectively and its central link now includes the Washington Post's correction.)

Comment Where is it practical? (Score 1) 127

But it does not allow rockets to reenter the Earth's atmosphere at orbital velocities, slow down, and land.

How about the Moon and Mars? It seems to me that the fuel capacity of Dragon isn't enough to do both lunar descent and ascent just on the Super Draco thrusters and the trunk's fuel capacity.

Comment What's really impressive (Score 2) 127

The impressive part is that they do it with an actual rocket that is 106 feet tall, and that they have launched it 7 times with 0 failures.

Using the same engine, rather than treating the engine as a disposable object that only performs one burn in its lifetime. Most rocket engines can't be throttled, can't be shut down and then restarted in flight or otherwise.

The tricky part is going to be for any stage to have enough delta-V to return to the pad after lifting a payload to orbit. Also, as far as I can tell, this takes a drag chute for lower stages, and a re-entry shield for upper ones.

Bruce

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