According to the author, Lisa Randall, what drives scientists to study the unknown?

Physics, by ts very nature, can often seem chimerical, elusive, and strange for the simple reason that it is not always possible to design experiments to test new ideas. In many instances, theories and intuitions precede scientific proof. Occam's Razor and the notion of elegance have proven to be useful guidelines for intellectual exercises in physics and other sciences. Lisa Randall shows that the Hadron Super-Collider in Switzerland, space satellites, and even balloon excursions into the upper atmosphere have proven to be very useful tools for astrophysicists to push ahead their ideas and theories. It is finding answers for the many unknowns that drives scientists. Curiously, it is also imaginative curiosity that drives the works of many science fiction writers.