[T]onic water glow[s] under ultraviolet... because the ... is fluorescent. ... ink is also acting as an… — Helen Czerski

The basic principles alone often won't provide specific answers, but they'll provide the context needed to ask the right questions. And if we're used to working things out... we won't feel hopeless when the answer isn't obvious...

This book is about linking the little things we see every day with the big world we live in.

As far as we know, the physical laws we observe... on Earth apply everywhere... You can test them for yourself.