Nature
Articles about the natural world and its phenomena.
Observation
Old-growth forest
Opacity
Opacity: optical, material, digital, and metaphorical meanings
Paper
Paper: composition, production, history, types and uses
Comprehensive overview of paper: its materials and manufacture, varieties, historical development, common uses, the pulp and paper industry, and environmental considerations.
Pasture
Pebble
Pebble: definition, formation, uses and significance
Pendjari National Park
Photopsin
Pica d'Estats
Poaching
Poaching: illegal killing and capture of wildlife
Polyamide
Pond
Prairie
Pre-1600 Atlantic hurricane seasons
Psychedelic mushroom
Psychedelic mushroom (psilocybin mushrooms)
Puddle
Puddle: small uncontained collections of surface water
A puddle is a shallow, uncontained accumulation of liquid on a surface. This article explains how puddles form, their physical properties, ecological roles, hazards, and ways they
Puffball
Rain
Rain: Formation, Types, Measurement, and Impacts
Rainforest
Rainforest: ecology, distribution, structure and importance
Raw material
Raw material: definition, types, uses and economic importance
Red hair
River Taw
Rose quartz
Ruby
Ruby (gemstone)
Samara (fruit)
Samara (winged fruit)
Satin bowerbird
Satin bowerbird (Ptilonorhynchus violaceus)
Scoutcraft
Scoutcraft: practical outdoor skills, history, and modern practice
Self-organization
Self-organization: spontaneous order in natural and artificial systems
Sequoia National Park
Shade
Shadow
Silk
Smell
Sněžka
Snorkeling
Snorkeling: an accessible way to observe marine life
Softwood
Softwood: Characteristics, Uses, History, and Distinctions
Spectrum
Spectrum: visible light, types, and scientific importance
Spider web
Spider web: structure, function, and types
Spinneret
Sporocarp (fungi)
Sporocarp (fungal fruiting body): form, function, and examples
Spring
Spring: season of renewal — causes, characteristics, culture and uses
Squall
Squall (meteorology): sudden, sharp increase in wind