Iron

Armed with encyclopaedic knowledge on genetics and what appears to be a magnetic attraction to storytelling, Sharon Moalem has written a book called Survival of the Sickest, in which he muses on such intriguing questions as the battery life of Apple products.

As always, a mind clear enough to think of the theory of relativity – like Albert Einstein – would be able to explain the theory to anyone. Sharon Moalem has managed to explain evolutionary advantages of "sick" genes in a way layperson can understand.

We might not comprehend the reason of programmed aging, for example. But it isn't that difficult to figure out why we wouldn't buy an extended warranty on an iPod if we were only going to keep it for a week. That's how Sharon Moalem makes use of simple scientific writing and drawing analogy.

One of my favourite chapters, "Ironing it Out", eloquently unravels the mystery of Sharon Moalem's grandfather who loved to donate blood. How does blood donation make one feel good emotionally and physically? And that's not all. How did off-the-charts excess iron levels nearly kill an ultramarathon runner at the Sahara Desert? How did iron boosting or iron-supplemented food kill the anaemic Maori babies who were lacking iron? 

Whatever the evolutionary reason, it is clear that every gene – like haemochromatosis mutation – has flip sides like that of Janus.