Hot springs are geothermal springs with water temperatures above 21-50°C. Water is heated by magma or crustal heating through faults. About 45-90% of Earth's heat comes from radioactive decay
Arboretum is a botanical collection of trees and shrubs. Term first recorded by John Claudius Loudon in 1833. Egyptian pharaohs planted exotic trees from Sudan and Syria
Dark ring forms around iris where sclera meets cornea. Appearance varies with pupil dilation, narrowing with larger pupils. Some contact lenses are colored to simulate limbal rings
Indigenous American cultures smoked tobacco ceremonially before European arrival. Tobacco was introduced to Europe in 16th century. Pipes range from simple machine-made to highly prized handmade
Lemurs are wet-nosed primates endemic to Madagascar. Range in size from 30g mouse lemur to 160-200kg Archaeoindris. Most species live in trees and are active at night. Share primitive traits like wet nose and divergent digits
Moths have over 160,000 species worldwide, compared to 17,500 butterfly species. Most moths are nocturnal and live only 40 days. Their wingspan ranges from 4 millimeters to over 9 inches. Their bodies are covered in scales that look like small hairs