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

When Charles Darwin formulated his theory of evolution, he appealed to the logic of ancestry, the evident diversity of species, and the magic of time....

Lichens resemble plants or fungi, with elaborate branches like ocean coral, tiny cup-like structures, or leaf-like fronds. They can be found growing...