Time was when physicists dreamed of a final theory of fundamental physics, a perfect set of equations that would describe every force and particle in nature. Today that dream is being overtaken by the suspicion that there is no such thing. Some even fear that all attempts at a deeper understanding of nature are dead ends. This will lend support to those who have long claimed that research into fundamental physics is a waste of time and money; that at best it provides answers to obscure questions which few people understand or care about.

So do these reservations undermine pure physics as a scientific pursuit? Surely, it makes no difference if the truths that physicists seek turn out to be more complex and messy than they once hoped. It could even make the search more intriguing. There are as many profound questions out there as there have ever been, and to answer them physicists need the kind of hard experimental evidence that can only come from pure research.

Can we, therefore, justify spending the huge sums of money that such research demands? What it boils down to is whether we think the search for fundamental truths is important. This quest for knowledge is a defining human quality, but it’s hard to quantify how our lives have been ‘improved’ by it. There have been plenty of technological spinoffs from the space race and other experiments. But the spin-offs are not the point. In showing us how the universe works, fundamental physics could also tell us something profound about ourselves. And for that, a few billion dollars would be a small price to pay.