Chemistry Apparatus Cartoons: The Test Tube

This follows on from yesterday's post, the beaker.  There isn't much more to say, really, except that you'll start to see the overall cartoon/pun theme develop from here onwards.  I've always enjoyed chemistry and always had a liking for puns and cartoons... the rest is obvious!  The next post will be a development from the test tube.

I've produced a short series of Chemistry cartoons, including The Test Tube, The Side-Arm Test Tube, The Delivery Tube, the beaker and The Measuring Cylinder.  I do have a 'formal' Chemistry background, and have also written some more serious articles on Chemistry, including how I transferred from Chemistry to a career in online web analytics.

Chemistry Apparatus Cartoons: The Beaker

This post is very short; in fact it'll be one of the shortest I ever produce.  However, it will also be the first in a series, and the series is 'chemistry cartoons'.  I first drew these around 10 years ago, and I've redrawn them and improved them a little since then, but they're very similar to the originals.

The first is the beaker.

More to follow shortly.

I've produced a short series of Chemistry cartoons, including The Test Tube, The Side-Arm Test Tube, The Delivery Tube, and The Measuring Cylinder.  I do have a 'formal' Chemistry background, and have also written some more serious articles on Chemistry, including how I transferred from Chemistry to a career in online web analytics.

Maths: Fibonacci Series (Multiplying Rabbits)

Consider, for a moment, a pair of adult rabbits in the wild.  Rabbits reproduce very quickly, (let's say once every month), and let's suppose that each time a pair of rabbits reproduces, it produces two young rabbits, one male and one female.  After a month, the new young pair is capable of reproducing.  What would happen to the population of pairs of rabbits over a number of years?


At the start of the first month, there's one pair of rabbits.  =1
After the first month, there's one pair of rabbits (and one young pair) =2
After the second month, there are two pairs of rabbits (the original pair, and the young ones have now matured) plus one young pair (from the original couple) =3
After the third month, there are now three adult pairs, and two young pairs (from the two adult pairs) = 5
After the fourth month, there are five adult pairs (three old ones, plus the two from the last generation), and three young pairs (from the three mature pairs last time) = 8


Finally (for this discussion), after the fifth month, there are eight adult pairs (five plus the three new pairs) and five adult pairs = 13 pairs of rabbits.


Let's look at the sequence again...
To start with, we had 1.  Then 1 again, then 2, 3, 5, 8, 13.


This sequence is known as the Fibonacci series, after the Italian gentleman who first identified it (Leonardo Fibonacci, 1170-1230).  In simple terms:  to find the next number in the sequence, add together the previous two numbers.


1 + 1 = 2
1 + 2 = 3
2 + 3 = 5
3 + 5 = 8
5 + 8 = 13
8 + 13 = 21
13 + 21 = 34
21 + 34 = 55
34 + 55 = 89 and so on.


Fibonacci - Mathematics


This sequence grows very quickly - as the rabbit population would - and it has some interesting properties.  Firstly, though, it doesn't graph very well on a normal graph scale...

The large values for the later terms in the sequence completely overwhelm the smaller values, so that the first part of the graph looks like a horizontal line.  A logarithmic scale on the y-axis will help show the growth in a little more detail.  The vertical y-axis now counts 1, 10, 100, 1000 etc with equal spacing.

Which shows something I suspected - we can accurately describe the Fibonacci series as logarithmic.  

Let's look at how quickly the series increases, by dividing each term by the previous one.

We can see that the growth rate fluctuates for the first few terms, but after eight terms, settles down considerably, and then reaches a value of 1.618033988749890 after 40 terms.  This number is called the Golden Ratio, and it appears in various mathematical (and non-mathematical) situations.

Borrowing from Wikipedia, the Golden Ratio can be defined as...

Rectangle

The ancient Greeks knew of a rectangle whose sides are in the ratio of the Golden Ratio.

It also occurs naturally in some of the proportions of the Five Platonic Solids (the tetrahedron, cube, octahedron, dodecahedron and icosahedron).   This so-called Golden Rectangle appears in many of the proportions of that famous ancient Greek temple, the Parthenon, and in the Acropolis in Athens. However, there's no original documentary evidence that this was deliberately designed in.  A Golden Rectangle also has visually pleasing proportions, see the larger rectangle below.  The horizontal sides are length 1, the vertical sides are lenth 1.61803...

Spiral

The Fibonnaci series can be used to produce a spiral; the title link above shows how this is done.  However, to summarise, by drawing squares with sides equal to the terms of the Fibonacci series, adjacent to each other, and by proceeding in a clockwise (or anti-clockwise) manner, it's possible to draw up a connected series of squares.  Yes, I'm borrowing from Wikipedia again:

And then draw quarter-circular arcs using the corners of the squares, so that they trace out into a spiral.  The area in red below corresponds to the area shown above.

Fibonacci in Nature

Apart from unchecked rabbit populations, the Fibonacci series shows up in a number of natural places - in flower petals, pine cones and so on.  My personal favourite is where the Fibonnaci spiral shows up in shells, and I've had this picture on the wall next to my desk for some time.  It reminds that even though numbers can get pretty ugly, they can also look remarkably beautiful.

The volume of each chamber within the shell follows the Fibonacci series, all the way out to 3,524,578.

Many other spirals also follow the Fibonacci series.  So we can see the Fibonacci series has a wide scope, from the huge to the tiny;overall, though, the Fibonacci series is as simple as 1, 1, 2, 3 :-)

Other maths articles on a similar theme:

The Fibonacci Series
Fibonacci Constants Revisited
The Collatz Conjecture

Ulam Sequences

Word 3:45 Two: Matthew 2

Matthew 2

Matthew's gospel moves very quickly from Jesus's genealogy, a few paragraphs about his birth (compared to Luke who spends two chapters there) and straight on to the visit of the Magi, then Herod's plans to find and kill Jesus.

Verses 22-23 of Matthew 1 reads, "All this took place to fulfill what the Lord had said through the prophet 'The virgin will conceive and give birth to a son, and they will call him Immanuel'(which means “God with us”)."  This is a recurring theme throughout Matthew's gospel; he constantly points to the Old Testament prophecies about the Messiah, and then shows that Jesus was fulfilling them.  The phrase, "this took place to fulfill the prophecy.." or similar, occurs once in Matthew 1 (not including the entire genealogy, which we saw last time is a great long list of fulfilled promises) and three times in Matthew 2, and that's just for starters!

In Matthew 2 we get political refugees and infant genocide.  We wouldn't normally call it that, because it's all couched safely in different words than that, but that's what it comes down to.  Joseph and Mary have to flee to Egypt with Jesus, to avoid the slaughter of all young boys that was ordered by a paranoid Herod.  

Matthew 2 is a short chapter, just 21 verses, and most of it is very well known.  It's straight-forward enough, but one question I have is why go to Egypt?  Why not forget about the whole incident, or perhaps God could have directed the wise men directly to Bethlehem instead of to King Herod?  There are parallels with Moses, who led the people out of Egypt and into the Promised Land, which could well be what Matthew is highlighting here.  

I should mention at this point that Luke's gospel doesn't have the 'flight to Egypt', but Matthew and Luke aren't contradicting each other - it's just that they're highlighting certain events.  Luke doesn't feel it's relevant to include the flight to Egypt, but Matthew does, for other reasons.  Matthew is aiming throughout his gospel to highlight how Jesus was foretold in the Old Testament, and the parallels with other Old Testament characters help him to support and highlight this point.

Other articles I've written based on Biblical principles

10 things I learned from not quite reading the Bible in a year
Advent and a Trip to London
Advent: Names and Titles
Reading Matthew 1
My reading of Matthew 2
The Parable of the 99 Sheep
Why I Like Snow (and isn't as crazy as you may think)

Puzzle: Snakes and Ladders

(also known as the Collatz conjecture, or Syracuse problem)


Courtesy of Calculator Fun and Games, which first introduced me to it, here's an interesting puzzle that is easy enough to understand, but which has developed into a far more complicated problem.  In fact, if you want to make the easy idea hard to understand, just go and read the Wikipedia entry - it is far too complicated, as much of maths on Wikipedia tends to be.


Anyway, here it is: Take a number - any number.  If it's odd, multiply by three and add one.  If it's even, divide by two.  Now take your new number and follow the same process - odd numbers multiply by three and add one, even numbers divide by two.  And so on, and so on.  

What do you find?  And, more importantly, does this always happen?


Let's try a few numbers:
35 is odd, so multiply by 3 ( = 105) and then add 1 = 106
106 is even, so divide by 2 = 53
53 is odd, so multiply by 3 (=159) and then add 1 = 160
160 is even, so divide by 2 = 80
80 is even, so divide by 2 = 40
40 is even, so divide by 2 = 20
20 is even, so divide by 2 = 10
10 is even, so divide by 2 = 5
5 is odd so multiply by 3 and add 1 = 16
16 is even, divide by 2 = 8, which is also even, divide by 2 = 4, then 2, then 1.


If (or should that be "When"?) you reach 1, then you stop.  Otherwise, you get stuck in a loop that goes 1 -- 4 -- 2 -- 1 -- 4 -- 2 etc.


The question is:  Do you always reach 1?  Is there a number out there somewhere that doesn't eventually drop down to 1?


The path length for numbers (how long it takes for a number to reach 1) is not predictable - certainly not easily, as far as I know, and so there's much research there as well.


For example, 26 follows the path 26 - 13 - 40 - 20 - 10 - 5 - 17 - 8 - 4 - 2 - 1


But 27 follows a completely different path...
27, 82, 41, 124, 62, 31, 94, 47, 142, 71, 214, 107, 322, 161, 484, 242, 121, 364, 182, 91, 274, 137, 412, 206, 103, 310, 155, 466, 233, 700, 350, 175, 526, 263, 790, 395, 1186, 593, 1780, 890, 445, 1336, 668, 334, 167, 502, 251, 754, 377, 1132, 566, 283, 850, 425, 1276, 638, 319, 958, 479, 1438, 719, 2158, 1079, 3238, 1619, 4858, 2429, 3644, 1822, 911, 2734, 1367, 4102, 2051, 6154, 3077,9232, 4616, 2308, 1154, 577, 1732, 866, 433, 1300, 650, 325, 976, 488, 244, 122, 61, 184, 92, 46, 23, 70, 35, 106, 53, 160, 80, 40, 20, 10, 5, 16, 8, 4, 2, 1


...with its highest point at over 9,000!  All in all, it has 111 steps in its path to 1.

Image from Calculator Fun and Games
(original was black and white line drawing)

Here are the paths for all the numbers 1-20 (and the numbers that they include):

Image from: "Professor Stewart's Hoard of Mathematical Treasures"

There are various puzzles connected with this problem.  The main one is to prove that all paths end at 1, but that's still not been completely solved yet, and some of mathematics' greatest minds are having a go.

A good alternative, though, is to find the longest path possible for three-digit and four-digit figures.  I'm not sure if it's a puzzle, or a game, and if it's a game, then I figure it'd probably spoil it for you to know the answer before you start :-)

This was my first post on the Collatz conjecture, but I enjoyed investigating it so much that I wrote (and continue to write) a series of articles about variations on it, and you can find them in my Collatz conjecture category.  The next article in the series is Collatz Conjecture 5n+1 and after that, Collatz Conjecture 3n+3.

Puzzle: Magic Square

I'm not entirely sure if this puzzle already has a name... it probably does, but I haven't found it. I think it's probably fair to call it a magic square, since the idea is to use a set of numbers in a square to achieve the same total in the rows, columns and long diagonals.  The difference here is that the numbers are four sets of the numbers 1-4, in four different colours (white, grey, black and yellow), and there's an additional condition that no row, column or long diagonal must have a colour repeated.


To make it easier to explain, here is a set of blocks, showing the four digits 1-4 in their four colours (sixteen blocks in total).

There are a number of solutions to this puzzle, and I have no intention of calculating the number.  Instead, I'm going to look at an example solution, and discuss my thoughts on it, so that - hopefully - you'll be able to solve similar problems in the future.

I was going to insert a few line breaks here, just in case you're included to try and solve the problem without the solution.  

However, I suspect the answer is complicated enough that you won't solve it just by glancing at the answer!

Here's one solution, then:

There are a number of comments I'd like to make on this solution, but before I do, I'd like to introduce (or re-introduce, if you've seen it before) a distance that I call the knight-move.  In Chess, the knight moves by going one square forwards, backwards, or left or right, followed by two squares left, right, or backwards or forwards (at 90^o to the original direction) .  Again, it's easier to show with a diagram, so here goes:

This motif shows up a number of times in the magic square puzzle here, and in many other puzzles of the type, "Arrange the numbers so that such-and-such don't appear in the same row or column."  Let's look at the solution again; firstly, here are all the 4s.

Can you see how the 4s are all connected by a knight-move, starting from the four in the top corner?  The sequence grey-yellow-white-black is a series of three knight-moves.

The same applies for any of the other numbers, for example, the 2s start from the bottom right.  The whole solution has rotational symmetry - if you imagine moving the grid around by a quarter turn, then you find the same solution for a different number (1, 4 , 2, 3 in this example).


The same also applies for the coloured numbers - in the next diagram I've highlighted the white numbers.  Starting in the lower right corner with 2, the white numbers are all connected by knight-moves (one across and two up, or two across and one down, etc).

Notice here that one knight move from the white 2 gives the white sequence (shown above), while the other knight move from that 2 gives the sequence for all the other 2s.


So, whenever you encounter any puzzle of the form, "Put the objects into the grid so that each row and column only contains one of each type of object" - whether it's numbers, letters, or shapes, remember the knight-move as a short cut towards the solution!

Word 3:45 One: Matthew 1

Matthew 1

Matthew begins his gospel with the ancestry of Jesus, all the way back to Abraham.  For a Jew, it was very important that they could demonstrate they were one of Abraham's descendants, and were therefore thoroughbred Jews.  We'll see this frequently in Matthew's gospel.

Most people reading Matthew 1 today don't see the relevance - even taking into consideration that Matthew was demonstrating Jesus' validity as a Jew.  However, Matthew was also demonstrating a key point: God always keeps His promises.  God had made promises to a number of people in the Old Testament, that one day, their descendant would be the Messiah.

Let's look at a few examples:

Abraham

Genesis 12 v 2-3

'I will make of thee a great nation, and I will bless thee, and make thy name great; and thou shalt be a blessing: And I will bless them that bless thee, and curse him that curseth thee; and in thee shall all families of the earth be blessed'.


Judah
Genesis 49:8-10
"Judah, your brothers will praise you; your hand will be on the neck of your enemies; 
   your father’s sons will bow down to you. 
You are a lion’s cub, Judah; you return from the prey, my son. 
Like a lion he crouches and lies down, like a lioness—who dares to rouse him? 
The sceptre [a symbol of royalty] will not depart from Judah, 
   nor the ruler’s staff from between his feet, until he to whom it belongs shall come"


David
2 Samuel 7:16 
"Your house and your kingdom will endure forever before me; your throne will be established forever."


And another more obscure member of Jesus' ancestors:

Zerubbabel (Matthew 1:12.  Zerubbabel  led the work on the reconstruction of Jerusalem from the rubble that was left when the Israelites returned from their exile).

Haggai 2:20-23
 ²⁰ The word of the LORD came to Haggai a second time on the twenty-fourth day of the month: ²¹“Tell Zerubbabel governor of Judah that I am going to shake the heavens and the earth. ²² I will overturn royal thrones and shatter the power of the foreign kingdoms. I will overthrow chariots and their drivers; horses and their riders will fall, each by the sword of his brother.

 ²³ “‘On that day,’ declares the LORD Almighty, ‘I will take you, my servant Zerubbabel son of Shealtiel,’ declares the LORD, ‘and I will make you like my signet ring, for I have chosen you,’ declares the LORD Almighty.”

The signet ring in Old Testament times was a royal symbol.  A signet, engraved with the king's seal, was used to endorse official documents.  To guard against misuse, the king wore it as a ring or on a necklace.  God declares here that He's chosen Zerubbabel and would keep him safe to fulfil his appointed purpose; since this didn't happen during his lifetime, we can see that this would extend to one of his descendants... and sure enough...

There are quite a few other interesting characters in Matthew 1... and I like to think of it as a roll of honour.

Other articles I've written based on Biblical principles

10 things I learned from not quite reading the Bible in a year
Advent and a Trip to London
Advent: Names and Titles
Reading Matthew 1
My reading of Matthew 2
The Parable of the 99 Sheep