1 What existed before the universe - and why?
2 Why might there have been an ever bigger bang before The Big Bang?
3 How is it possible to know that Earth was hit by asteroids and comets in the past?
4 Why is Earth likely to experience its sixth mass extinction now?
5 What sort of questions should you ask for meaningful and productive discoveries?
Just a minute
THE GOOD
1. The American physicist Lisa Randall is as precise a communicator as she is a scientist. She has turned one of the most complex subjects - how the universe works - into a pageturner. Who knew that cosmic dust and gravitational forces could be so compelling to read about?
Randall uses pop culture references and examples from everyday life whenever ideas get too deep. For example, she says the universe's invisible fabric known as dark matter is like the excitement that builds around Hollywood star George Clooney's impending appearance - palpable and a strong influence on one's surroundings.
2. She paces her narrative well, breaking down a hard-to- grasp discipline into its basic principles before bringing all of these together in a denouement, which fellow physicist Graham Farmelo implied recently is a theory crazy enough to be correct. Her approach in this book is in the manner of a cosy country house mystery - acknowledge the mystery, introduce the suspects, spotlight each of these characters and then bring everyone together for the mystery's resolution.
3. Randall takes great pains to remind readers now and again that what she is telling them is, essentially, a big leap of her imagination. Her belief, then, that dark matter unleashed a comet that smashed into Earth 66 million years ago, wiping out dinosaurs, is still "a stretch", she says. Most of her previous stretches of imagination are now part of mainstream scientific thinking.
4. The science behind star-gazing is suffused with jargon and mathematics. Randall has been able to write her book without jargon or mathematical formulae.
THE BAD
1. The illustrations are the worst I have seen in recent years. These are contained within boxes the size of a quarter of an A4 page and are made up of mainly blurry, smudgy and grey-on-black representations of asteroids, stars and galaxies - with text so tiny, you have to squint to read.
THE IFFY
1. Occasionally, she ruminates about how humanity is ruining the earth, by consuming and degrading so much of its resources that the environment is now off-kilter. Like skits that do not fit within a serious drama, her Save- The-Earth interludes add little to what is one of the best books this year.
Fact file: First in family with PhD
Those who meet the blonde, fine-featured American physicist Lisa Randall for the first time sometimes think her a cosmetologist, which she finds "very funny" because, as she puts it in her book, Dark Matter And The Dinosaurs, she is "poorly suited" to be a beautician.
Randall, 54, is a cosmologist, or one who studies why and how the universe came to be and how it is evolving.
Based at Harvard University, she says a cabby once asked what to her was the best question. When she mentioned that she was a physicist, he asked if he could ask her a question.
As she recalls in her book: "Upon learning that I'm a physicist, many people feel compelled to tell me their attitude towards the subject... I find this a bit funny. After all, most of us don't feel the need to inform lawyers, for example, about our thoughts on jurisprudence."
That said, she was bowled over by the cabby's query: If she could go back in time, what would she tell people then about what she now knew about the universe?
He was, she says, spot-on about the dilemma of how scary her findings could seem to them.
Randall has reportedly long liked the idea of certainty that mathematics and science bring. That was how she got stuck on studying the ingredients that make up the universe, or particle physics, and imagining how the universe came about in the first place, or theoretical physics.
She refuses, however, to be drawn into any discussion as to how God fits into the scheme of things. "To be clear, mine is not a religious viewpoint. I don't feel the need to assign a purpose or meaning. Yet, I can't help but feel the emotions we tend to call religious as we come to understand the immensity of the universe, our past, and how it all fits together," she writes in the book.
One of three daughters of a salesman and a primary schoolteacher, Randall grew up in Queens, New York. She was a shy girl whom teachers constantly encouraged to be more confident to achieve her dreams.
She did, and as she told journalist Sarah Baxter of The Sunday Times of London in June 2005, "I was the first in my family to get a PhD". One of her two sisters is mildly autistic.
To a question from Baxter as to whether there are living beings beyond humans on Earth, she mused: "If it's there, it's likely to be based on a fundamentally different chemistry. It really extends your imagination. It's not just a question of little green men with antennae."