Every rock, every peb­ble, every grain of sand has a sto­ry to tell of the evo­lu­tion of the earth. Every blade of grass is a poem of the past. Our own bod­ies are muse­ums of our his­to­ry, our cells are the scrap­books of our micro­bial ances­tors, we breathe the exha­la­tions of bac­te­ria that swam in ancient seas. The sto­ry of the earth is wait­ing to be read.