Modern humans’ ancestors

All scientific evidence points to the fact that, if you go far enough back, all life on Earth is related through common ancestry. Turns out that applying the same sort of analysis shows that all humans alive today are descendants of one man and one woman who walked our planet thousands of years ago. For several decades, there has been debate about when these ancestors, popularly known as Y-chromosomal Adam and mitochondrial Eve, existed. Two studies published this week find that there is a good chance Adam and Eve may have existed about the same time, evolutionarily speaking.

Genetic Adam and Eve may have walked on Earth at the same time. The Conversation, 1 August 2013.

Image credit: FurLined

Why choosing a career is hard and why it should be

When someone asks me how I came to be what I am today, I say that I walked down the path of diminishing salaries and stopped where I felt that that is the least I needed to earn. What I don’t tell them is that, if there is one thing that I’ve struggled with constantly as a young adult, it would be with my choice of career.

At the age of 17, when I was about to enter university, I wanted to make lots of money but also be as educated as my dad. The middle ground was to become an engineer, earn an MBA and get a high-paying job. Chemistry and maths were the subjects I liked, so I decided to do chemical engineering.

At 20, in the middle of my engineering degree, I decided that my education was too shallow. To be truly valued I needed to become an expert. Earning money can wait. This is why I decided to pursue a PhD in organic chemistry, the subject I enjoyed the most.

At 23, in the middle of my PhD, I realised that, while research is a noble pursuit, my temperament is not cut out for a life spent trying to solve problem in a single narrowly-defined field of science. There were far too many interesting things happening in the world to not know and think about. That is when I started blogging about science. And money had merely become a means to an end, not an end in itself.

Now, at 26, having finished my PhD, I have become a science journalist. It seems like the job that I feel I could do most with given my skills, my temperament and my ethical code. It is the job in which I’ve found myself to be most at peace with myself.

And yet, even today I struggle with my choices. Every so often, I have to take a few steps back and look at what I’m doing. I feel torn about the opportunities that I may have let go on my way here, and those I still let go because I’ve made a decision to do something else.

Hard at work
Hard at work? Be sure to think about why you work. Svein Halvor Halvorsen

Do all young adults suffer from the same? Do they all give this critical choice of their life enough thought? Do we even have a culture that promotes deep thinking about our own careers? From what I read on Cal Newport’s blog, the answer to all the above questions seems to be “no”.

In a sharp commentary, Ezra Klein, a Washington Post columnist, explains that this lack of thinking about careers (or, more precisely, “no idea what to do next”) leads the world of finance to swoop up smart graduates with great work ethic. These kids did not enter university thinking they are going to spend their life making money for the already rich, but for the lack of better options and the attraction of a fat paycheck that’s what they end up doing.

Thinking about your career is as much a responsibility to yourself as it is to society that depends on you. In your lifetime there will be only so many hours spent working and contributing to the world (80,000 by one estimate), the least you can do is ensure that those hours are spent productively.

Newport’s summary of the three things that one must think about when choosing a career is a good start:

  1. The value of craftmanship
  2. The importance of lifestyle
  3. A personal ethic

That I would contend is still not enough.

How the moon affects our sleep

Just as solar cycle influences when we sleep, a new analysis finds that lunar cycles have some effect too. In the few days before and after a full moon, volunteers of this study took an average of 5 extra minutes to fall asleep, slept 20 minutes less per night, their delta activity (a measure of how deeply they were sleeping) was 30% lower than at other times, their level of melatonin, a sleep-related hormone, was reduced, and they reported, subjectively, that they had not slept as well as usual.

The study involved 33 volunteers who were completely isolated from daylight (and thus moonlight too). Thus, this effect must not be because of the direct effect of moonlight but instead it may be an endogenous cycle that evolution has learnt over millions of years.

Reference: C. Cajochen et al. Current Biology 2013

Further reading and Image credit: The Economist