### Did you solve it? The birthday birthday problem

In my puzzle blog earlier today I set you the following problem: Ariel, Balthazar and Chastity are great mates, genius logicians and they always tell the truth. Neither Ariel nor Balthazar know the day or the month of Chastity’s birthday, so she decides to tell them in the following way: First, she says out loud,…

### Can you solve it? The birthday birthday problem

Hi guzzlers, My Monday Puzzle column celebrates its third birthday this week. What better way to mark the occasion than a puzzle about a birthday! Ariel, Balthazar and Chastity are great mates, genius logicians and they always tell the truth. Neither Ariel nor Balthazar know the day or the month of Chastity’s birthday, so she…

### Connecting the dots to unlock brain structure

Hernando Ombao (right) hopes that more quantitative scientists will become interested in furthering understanding of the roles of genetics on brain function and behavior. Credit: KAUST Mapping genetic influences on connections between neural networks could lead to a better understanding of brain organization and behavior. A review of recent developments in statistical methods has highlighted…

### Topic-adjusted visibility metric for scientific articles

An actual scientific article (from the KDD Cup dataset) with known citations was used to demonstrate how the algorithm could generate recommendations for researchers searching for information in a related field. Figure shows the top 15 citations recommended by the metric. Out of these 15 predicted citations, five of them (marked with asterisks) were actual…

### Joyce Fletcher obituary

My aunt Joyce Fletcher, who has died aged 88, was an educationist who taught in Britain and Nigeria, where she worked on a series of maths books for primary schools, including teacher guides and workbooks, which became widely used. A couple of years ago when she was in hospital, one of the nurses, Nigerian by…

### Did you solve it? I'm a mathematician, get me out of here!

In my puzzle blog earlier today I set you the following puzzle: Imagine you are in a grid 100 squares long and 100 squares wide. (The grid is fixed to the compass directions: up/down is N/S, and left/right is W/E.) On each square of the grid, there’s an arrow. Each arrow is pointing either N,…

### Can you solve it? I'm a mathematician, get me out of here!

Hi guzzlers Today’s puzzle is for escapologists. Imagine you are in a grid 100 squares long and 100 squares wide. (The grid is fixed to the compass directions: up/down is N/S, and left/right is W/E.) On each square of the grid, there’s an arrow. Each arrow is pointing either N, S, W or E. Choose…

### Math sheds light on how living cells 'think'

Credit: Queensland University of Technology How does the ‘brain’ of a living cell work, allowing an organism to function and thrive in changing and unfavourable environments? Queensland University of Technology (QUT) researcher Dr. Robyn Araujo has developed new mathematics to solve a longstanding mystery of how the incredibly complex biological networks within cells can adapt…

### Longest straight-line ocean path on planet Earth calculated

Longest sailable straight line path on Earth. Credit: arXiv:1804.07389 [math.HO] A pair of researchers, one with United Technologies Research Center, the other with IBM Research, has developed an algorithm that can be used to determine the longest straight-line path over water on Earth. In their paper uploaded to the arXiv preprint server, Rohan Chabukswar and…