fr0sty

Does anyone know of a source for more of the "Watch Mr. Wizard" episodes (the black and white ones)? A few are on YouTube, a selection was made available on DVD (since out of print and quite expensive) but I have found no others.

According to his Wikipedia page he filmed 547 episodes but only a handful are still accessible.

I ask mainly for my son who keeps asking to "watch a Mr. Wizard video" and who is well into reruns of what is available on YouTube.

Turning off the ignition may deactivate your airbags* which could make a bad situation worse.You would be much better off attempting to shift your car into Neutral first.

* This was what made the GM Ingnition switch problem so deadly. The engine shut off (taking power steering and vaccuum-assist braking with it) and the airbags deactivated making any subsequent crash less survivable.

Brian May of Queen built his guitar with his father while he was a teenager and used it for most of his career:

http://en.wikipedia.org/wiki/Red_Special

By my reading of the article the attacker gains access to user's Starbucks account, adds another card and transfers money to it. It doesn't appear to involve the mobile app at all.

The real problem seems to be with the lack of rate-limiting of the auto-reload feature.

Tesla car batteries are between 60kwh and 85kwh. These packs are 7kwh or 10kwh. Not going to get you that much farther with only a 10-15% increase in capacity...

Thank you for mentioning this. Too many people in this thread forget that not everyone lives in a temperate coastal area.

I'm pretty sure there is at least one stopping place between 35 residents (one of the 'villages' from the article' and the 16,000 of Cabrini-Green.

Simpson's paradox paradox comes into play here a little bit. Your risk of dying of prostate cancer is in the ballpark of 1 in 40 but your risk of dying of heart disease is 1 in 4.

If trading a higher risk of prostate cancer for a lower risk of heart-disease (which others have mentioned) might be the better choice here.

Caveats abound here, of course, but just because something 'increases your risk of' something doesn't mean it's an aggregate loss.

>A 10 year old Mercedes in great shape is probably worth about 15-20K.

Not even close. The three Kompressor models in '03 were the C230, C32 AMG and SLK32 AMG. KBB trade-in values for those cars are about $3k, $5k, and $10k respectively and it is likely they had the C230 otherwise the author would have called it their Mercedes AMG.

Luxury cars are terrible at retaining their value. If you want that, buy a Honda Accord or Toyota Corolla.

> So record every police encounter, always.

Unless you are in a jurisdiction where such actions are illegal...

Previous discussions:

310 days ago: https://news.ycombinator.com/item?id=6972411

89 days ago: https://news.ycombinator.com/item?id=8139669

Your camera is not the typical kit used by most professional photographers, though. Uncompressed RAW files from a Nikon 810, for instance, are 72MB so your 16G card could hold just over 200 shots a piece.

Of course, whether having an entire photoshoot on a single piece of (relatively fragile) storage is a good idea is another question entirely.

They are not "riding on" but rather being "pushed by" the sheets of ice.

>city bus should be able to operate at or near optimum stoichiometric conditions at all times

Diesel motors operate quite differently than gasoline engines in this regard, actually. A diesel motor is only operating at the correct stoichiometric ratio at full throttle and is running lean for the rest of the time because there is no throttle plate to modulate air intake and power is only modulated by the quantity of fuel injected into the cylinders.

The issue with that, is there's no good way for the doctor to get paid for doing it. Prior to 2009 there was no billing code for phone calls or email and currently the rules around what is a "billable" consultation are complex and the coverage by insurers is far from uniform.

More info here: http://patients.about.com/od/followthemoney/f/Why-Doctors-Wo...

Not for free, liquidity providers are paying to trade in IEX (and paying the same rate as the takers).

Publishing date of that post was April 1st, for what it's worth...

The binaural recordings are more than a little spooky. Even knowing before hand that they were going to play the sound of someone knocking on doors I had to fight the temptation to turn and look at sho was knocking on the desk next to me.

Aside from the broader war strategy questions, this appears to be a good example of the second-system effect.

An unknown number of attempt end with the stowaway falling out of the wheel well after takeoff and before touchdown.

What is your definition of HFT? Why exactly does it worry you?

any exchange member may submit a hide-not-slide order. there is nothing secret about them.

spread has an interconnect between Chicago and New York but that is not generally useful for HFT stock trading since nearly every execution venue is in New Jersey.

>The HFTs get to see the list of orders as they come in.

No, they don't. Third parties cannot see orders "as they come in". Only orders displayed in the exchange's book and executions already completed are sent out to data consumers.

In the example you created the 200k buy order is never displayed and as such is not visible to any other user. All an HFT can see is the 100k execution.

Again, an HFT rushing to buy in front of this order cannot know how big it actually is, nor what the limit price is and as such whatever buying is purely speculative and not a "guaranteed win".

> The feed the HFT gets is faster than the NYSE to NASDAQ feed.

Assuming for the moment that someone can see an execution from NYSE and route an order to NASDAQ in response in less time than NYSE can send their own order to that Exchange you haven't answered the rest of the question.

How does the HFT even know there is an order in-flight to NASDAQ? How does the HFT know that the buyer is willing to pay $10.02?

> You placed an ordinary 200,000 share limit order. You didn't use one of the special order types.

Is this supposed to be an answer? 100k executed at NYSE @ $10.00, this is public information. NYSE routed the other 100k to NASDAQ. Are you saying there is some way for Mr. HFT to know the particulars of that order to NASDAQ?

> knowing they can sell back to you when you buy the other half of your order.

You seem to be under the impression that at some point along the line someone besides the NUSE is seeing the parent order details (buy 200k @ $10.02). Please explain how you believe this information is transmitted to third parties.

Please explain how My. HFT "intercepts" the trade in this case? How does he know your limit price? How does he know your parent quantity?

Imagine an alternate scenario: You send an order "buy 100,000 shares $10.00 limit" to NYSE. Does the HFT spend $4MM buying up 200k on the off chance that you want more than the 100k you already bought? If not, why?

In your example both NY and Chi would be "crossing" the market (bid above offer) which is not generally allowed. The displayed quote on both exchanges is "protected" and another exchange can't lock or cross the market without first dealing with the protected quotes (usually by routing orders to fill against it, see #2 below).

What would have really happened in your scenario would have been on of the following:

1. The orders would have been partially filled and the balance would be cancelled (order were Immediate Or Cancel)

2. The orders would be partially filled and the balance routed to other exchanges which are displaying the same price (Orders were routable)

3. The orders would be partially filled and remain active (but undisplayed) at the exchanges (this is dependent on what order type is used and at what exchange).

> how can non-HFT traders arrange to capture the surplus currently claimed by HFT?

By posting their order and waiting to be filled. In a two sided market your options are to pay up and be filled immediately or to get in line with everyone else that wants to keep that extra $.01 and wait for someone more impatient (or informed) to come along and sell to you. By providing liquidity you take time and price risk (you don't know when you will get filled, if ever, and the market may move away from you requiring you to have to pay more later) and by taking it you don't (but you pay the liquidity provider for the privilege).

"Someone will always be faster." That will always be true no matter what new trading format is being considered. There will always be a way for someone to get relevant information more efficiently and act on it. Always. Slowing down markets or obscuring/delaying quotation hurts price discovery and increases uncertainty. This increases volatility, widens spreads, and in all likelyhood actually tilts the playing field in the favor of high-speed computerized trading rather than away from it.

How does the HFT know the size of the buy order?

Alter the scenario here:

1. Buyer wants 25 shares, buys all available shares at his limit price on exchange A.

2. HFTs 1-n see the entire quote taken at Exchange A and rush to buy all available shares at that price on Exchanges B-K

3. HFTs now own a few hundred shares of Acme corp that they need to unwind.

Assuming things work the way you describe (they don't, but I'll play along) if there is no HFT involved how would you propose that this situation be resolved?

There is $.10 of surplus here. Who (if anyone) should get it, how, and why?

> Knight had test code that got flipped into production.

This is not correct. Read the SEC report on the incident if you have time, it is pretty in depth: http://www.sec.gov/litigation/admin/2013/34-70694.pdf

The short-version is that they re-used a parameter from an old feature and one of the production machines was not updated so the re-used parameter re-activated the old feature instead of the new one. Furthermore, A refactoring of the code had left the old feature on the wrong side of the share accounting code so the system was not keeping track of the orders it was putting out.