Cardiovascular diseases such as heart attacks and stroke, cancers, diabetes and chronic respiratory diseases such as chronic obstructive pulmonary disease and asthma are among the leading causes of death across the world.

Forensics is changing in the digital age, and the legal system is still catching up when it comes to properly employing digital evidence.

Broadly speaking, digital evidence is information found on a wide range of electronic devices that is useful in court because of its probative value. It’s like the digital equivalent of a fingerprint or a muddy boot.

However, digital evidence tendered in court often fails to meet the same high standards expected of more established forensics practices, particularly in ensuring the evidence is what it purports to be.

Last week, prominent tech site Gigaom ceased operations with the terse note “Gigaom recently became unable to pay its creditors in full at this time”.

Started in 2006 by Om Malik, the site had raised about $40 million over that period to create a technology news site, an IT analysis business and another business running IT events. None of them could make enough money to cover the $400,000 a month needed to keep the business going.

I’ve probably lost count of the number of ‘WATER ON MARS’ and related headlines I’ve read over the years. It’s an interesting case study of how a scientific theory gains support as more evidence is collected, until it becomes something ‘that is known’.

But last week we heard evidence that Mars has lost some water – an entire oceans worth in fact.

Pi Day – on March 14th – will be particularly memorable this year: the date can be written 3/14 by those who opt for the month then day format, which is Pi to two decimal places, 3.14.

If you include the year this year then that gives 3/14/15, which is Pi to four decimal places, 3.1415.

This happens only once a century, and the Museum of Mathematics in New York City, among others, is taking Pi Day 2015 one step further, by celebrating at 9:26 pm, adding three more digits to Pi, 3.1415926.

Speech problems in early childhood are common.