# Antimail

Adi Oltean's Weblog - Flashbacks on technology, programming, and other interesting things
• #### Puzzle: solve this equation!

You have the following false "equation", made with six toothpicks arranged on a table in the following way: XI = I You have to re-establish the equality by changing the position of a single toothpick. Common-sense rules apply: you are not allowed to bend...
• #### A simple way to access Shadow Copies in Vista

In the past, I presented various ways to browse these mysterious device objects called "shadow copies". Shadow copies are static images in time (snapshots) of your volume contents, at some point in the past. These shadow copies are volumes on...
• #### Simple probability problem

I love probability puzzles. Here is one I liked: There are a 100 people trying to get onto the same flight you are. The airplane has a 100 seats. You are all ready to board. You are the last one in the line of passengers at the gate. The first guy walks...
• #### Script recipe of the week: how to copy an opened file

I just read recently a post on the newsgroups - someone wanted to backup her PST file. The problem is that Outlook keeps this file open all the time, therefore we are unable to just copy this file once in a while. Argh... A cute little script ...
• #### The various aspects of Open Source

A funny thing that I just realized is that the term "open source" is generally used to denote several types of software. Without actually defining what "open source" means, I am thinking to several categories: 1) Hobby projects . These are projects started...
• #### Puzzle: How many witches are there?

It is known that in a certain city there are a significant number of witches, even though this practice is forbidden. The problem is that nobody knows who these witches are, since a witch is very careful to appear to others as a perfectly normal person...

This problem initially had two parts but now has three. OK, let's start with this: let's assume that we have two, trains, 100 miles apart, each going with 20 mph to the other. A fly travels between them at 50 mph, zig-zagging just before getting smashed...

• #### Puzzle: Shakespeare numbers...

Imagine that there might be a real number that contains (in an encoded form) the entire works of Shakespeare. Let's call this number a "Shakespeare number". Can you give an example of an algorithm to generate Shakespeare numbers? [update] The problem...
• #### Puzzle: geometry problem

Here is a fun one: The triangle ABC is isoseceles, with angle (ABC) = angle (ACB) = 80°. We draw now two segments inside the triangle. First, we choose the point D on segment AC such that angle (CBD) is 60°. Also, we choose the point E on AB, where angle...
• #### Attack of the clones: how to assign a drive letter or directory to a shadow copy

In one of my previous posts I mentioned a simple script to copy a file from a shadow copy. This allows you to access files that are opened exclusively by some application. You won't have enough drive letters... Here I present a similar script (let...
• #### Another puzzle: Gödel, Goldbach and other "G" names...

Mr Blobby posted an excellent comment in my previous post, outlining in a few words Gödel's proof of incompleteness of arithmetics. This is a mind-boggling result, which essentially states the following: There are certain statements (I would not say ...
• #### Puzzle: what is the next card?

This is a very nice puzzle that kept me awake for a long time... :-) John and Dianne, two journalists (and experienced bridge players), are captured by some foreign government. The guardian says that he can free them, if they win the following game...
• #### After life

Not sure if this is real, but it looke like some people love computers way too much...
• #### The new must-have gadget: Flash laptops

The entire world is now slowly shifting to Flash-based storage in mobile devices. The latest trend is to get rid of harddisks in your laptop - and you will have longer battery life, faster shutdown/reboot, better shock-resistance. Not to mention that...
• #### Little math problem

OK, probably you already had your latte this morning but here is nice puzzle: Let's say that a rectangle is "rational" if the ratio between the width and height is a rational number. Now, proof that a rectangle is rational if and only if the rectangle...
• #### NTFS Curiosities (part 2): Volumes, volume names and mount points

In the old days of MS-DOS and Windows 95 you could identify any volume by its drive letter. Things were so easy. But not anymore after we shipped Windows 2000. In W2K you could also have mount points - volumes mounted under certain directories. This feature...
• #### Is AJAX something revolutionary?

AJAX seems to be the new "buzzword of the day". In short, AJAX stands for "Asynchronous JavaScript And XML", an acronym coined by Jesse Garrett recently. The basic idea is very nice - you can actually perform client-side programming directly in the DHTML...
• #### Puzzle: a little geometry problem, and a sequence question

This is not really a puzzle, but a real geometry problem. Let's take a random triangle (ABC), and let's assume that the angle bisector from A intersects BC in the point D. Proof that: AD ^ 2 = AB * AC - BD * CD Here is the figure, drawn in MSPAINT...
• #### Hitting the search relevance wall

There is a curious fenomenon going on in the search arena today - something I call the "hitting the search relevance wall". The thing is that most search companies are getting so much better that it is hard to distinguish between them in terms of quality...
• #### Why do we buy books?

An intriguing comment on Slashdot: Why would I pay 8.00 for a paperback I know I'll probably only read once and then stick on a shelf or on a pile, when I can probably borrow the book for free from the Library? Psychology is fascinating... Schopenhauer...
• #### Building a bridge in France versus US

Recently I read an article about the newest bridge in Millau, France. Everything about this bridge is out of scale. The highest point is 1,125ft (343m). That's right - its pillars are taller than the Eiffel tower! And the highway is suspended at max 885ft...