Recent Nova Documentaries on WW2

Nova recently aired 2 good WW2 documentaries.



Bombing Hitler’s Dams

A British scientist rediscovers the physics and engineering behind the bouncing bombs used to destroy 2 German dams in the Ruhr Valley, and tests his theories on a 1/4 scale dam in Canada. He used a consumer video camera on a tripod to substantially reduce the amount of experimentation needed.

I wasn’t aware of the scale of the original raid, with 33 bombers assigned.

wikipedia: Bouncing bomb



3D Spies of WWII

I wasn’t expecting much from this one, but I sat with my jaw on the floor as they showed original WW2 stereograms and scale models of V1 and V2 factories and launch facilities, as well as the Ruhr dam bomb damage.

The producers were able to interview the original Spitfire photo-recon pilots and photo interpreters.

One pilot said he was flying and saw a vertical contrail from a a V2 rocket, but was unable to photograph it.

Britain and the USA had photo interpreter facilities close to each other in London, and cooperated on advanced camera technology.

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Crosswind Landings during a storm at Düsseldorf

You can see airline pilots doing “crab and kick” Crosswind Landings during a storm at Düsseldorf, with winds apparently 290 at 35 gust 55 while landing on 23L.

Some of the pilots couldn’t kick out of the crab, or find the center line, which indicates pilot training in Europe needs improvement.

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BIND and DHCP Open Day, Menlo Park

I went to ISC’s BIND and DHCP Open Day in Menlo Park.

There was a good turnout, with about 30 outside attendees and about the same of ISC staff. 3 BIND developers from the Czech and Chinese registrars also attended, as well as Cricket Liu.

Here’s my notes.

DNS

- can learn what you need to know (50%) in a day, lifetime for the next 50%

BIND9

- monolithic program
- 10 years old
- different syntax than BIND8, 30% slower

User Story – Quick Refresh at AOL

- VMs spark up in 9.5 seconds, but DNS takes 15 minutes or more to propagate in their system
- goal is 5 minute updates across globe

BIND10

- sponsored by 10 TLDs, unlike BIND9 which was sponsored by Big Iron vendors
- TLDs represent registrars, users or citizens
- started April 1, 2009
- 5 year plan
- now on year3 – features and performance
- release every 6 weeks
- will be no slower than BIND9
- postfix processes model, not threads
- scalable across cores
- modular
- logging
- reporting
- REST API
- save cache object to memory or network, could be 10s to 100s of MB
- no query or response logging, use tcpdump
- look at DLZ

DNS Provider Issues

- Dealing with large zones
- Dealing with lots of zones
- resource estimates (for sizing new servers)
- high-availability installations and technologies
– anycasting
– cooperate better with firewalls and load balancers
– auto-clustering?
– quagga support?
- multi-master
- support for fully mastered slave
– akin to powerdns “super masters”

- some debate over how much routing is appropriate inside dns
- do it all or just be fast
- does it make sense to send acl info over port 53? needed for cluster setup

DNSSEC Issues

- Deployment and Maintenance procedures
- in-line signing
– aka “bump on the wire” 9.9.0
– hidden master sends signed zones to slaves
– aka “signer in the middle”
- registry vs. registrar
- look at DomainKeys optionality
- DLV keys (don’t need a signed parent)
- zone monitoring is crucial
- 4 HSM known, $80k for qty 1
- some firefox plugins check ad bit
- dnssec slowest on negative answer, nsec3 worst

The event photos are available here.

Thanks to Facebook for hosting this event.

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Interview with Michael Copps Former FCC Commissioner on Democracy Now

Democracy Now has an excellent interview with Michael Copps, Former FCC Commissioner.

One could use his discussion as an outline for a national media and communications policy, if we did such a thing as public policy in the USA.

Transcript

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Flying with Head Cold or Sinus Problem

During the recent holidays, I unfortunately caught a head cold during my vacation trip and had to fly several legs with sinus congestion.

It is strongly recommended not to fly as a required crew member or passenger with a head cold, ear infection or sinus problem by medical and aviation experts.

Upon takeoff and especially landing, you cannot equalize pressure between the airplane cabin and the passages inside your ears and sinuses.

As a result, the following injuries can occur:

  • pain, sometimes excruciating
  • ruptured eardrums and middle ear problems
  • damage to sinuses.

The best advice is to either cancel the trip, or take surface transport like a train or boat if possible.

If you’re really stuck flying, here’s some further advice that can help if you’re a passenger:

  • short flights under 2 hours can cause less problems, as they typically stay under 25,000′
  • You will need a nasal decongestion drug to open your sinuses and ear passages. See an ENT doctor before flying if possible.
  • in the USA, take a Benadryl (pseudoephrine) capsule 5 minutes before takeoff and landing (if you have normal blood pressure)
  • in some Asian countries, Tremenza (pseudoephrine with triprolidine) tablets are available, but they take longer to become effective than capsules (if you have normal blood pressure)
  • Drizine (oxymetazoline hydrochloride) by Schering-Plough is a nasal spray that can also be used.
  • carry or request a bottle of water and drink it on takeoff and landing. You will be swallowing more than usual to equalize pressure, which you won’t be able to continue with a dry throat.
  • if you’re experiencing pain, especially on a USA airline, notify a flight attendant so that they understand it’s a minor medical issue and not a security problem.

Note that pseudoephrine is a controlled substance in the USA and other countries, so if you have a prescription, carry it with you when going through Customs, or discard the drug in a place safe from children.

I used the above techniques to fly 6 legs as a passenger with minimal discomfort, but I’d imagine luck was also on my side this time.

If you have chronic sinus problems when flying, then see an ENT doctor and request an endoscopic examination to look for blockages from polyps, infection or waxy buildups.

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