The delightfully creepy spider belongs to a class called Arachnida—which is distinct from the “bug” class Insecta. Not surprisingly,...

Bacteria are tiny single-cell organisms that show a huge range of metabolic and genetic variation, and also exist in a wide array of shapes and sizes....

Jeffrey P. Tomkins, Ph.D., and Tim Clarey, Ph.D. Scientists have long wondered how cold-blooded reptiles (ectotherms) like dinosaurs could have...