18 results for “skin”
The Human Body
Skin, Hair and Nails
skin make more melanin. Sunlight makes skin produce more melanin over a few days, which is what
Article · 3 min read
Animals
Reptiles and Amphibians
skin stays thin and moist and must be kept that way, because they breathe partly through
Article · 3 min read
Animals
The Octopus
skin is packed with millions of tiny colour sacs, called chromatophores, each controlled by muscles that
Article · 3 min read
Chemistry
Acids and Bases
skin. Many acids are weak and harmless. Citric acid gives lemons and oranges their tang, acetic
Article · 3 min read
The Human Body
The Senses
skin: none of these are experiences in themselves. They are physical events, and the senses are the instruments
Article · 4 min read
The Human Body
The Immune System
skin, in your gut, in the air you just breathed, there are microbes that would kill
Article · 4 min read
Life & Biology
What Is Life? The Cell
skin cells that form a barrier. All of them descended from a single fertilised egg, and all carry
Article · 4 min read
Planet Earth
The Atmosphere
skin on an apple. Everything that breathes depends on it, and almost everything about it is the work
Article · 4 min read
Animals
Birds
skin. A flight feather has a central shaft from which hundreds of barbs branch, and from
Article · 3 min read
Animals
Mammals
skin. They are a glimpse of what the earliest mammals were like. From the shadow of dinosaurs
Article · 4 min read
Matter, Energy & Physics
Sound
skin, a loudspeaker cone. As the object moves forward, it squashes the air molecules in front
Article · 3 min read
Animals
Sharks
skin is covered in tiny tooth-like scales that reduce drag so effectively that swimsuit designers
Article · 3 min read
The Human Body
The Skeleton and Bones
skin makes from sunlight and which the gut needs to absorb calcium, help keep bone strong
Article · 5 min read
Chemistry
Water: The Strangest Ordinary Substance
skin. Why it matters Every living thing we know needs liquid water. Its stickiness, its floating
Article · 3 min read
The Human Body
The Heart and Blood
skin and extremities, and it delivers the hormones that are the body's long-distance messages
Article · 4 min read
Chemistry
The Chemistry of Life
skin and bones together; and the proteins actin and myosin make your muscles move. Nucleic acids
Article · 3 min read
Planet Earth
Inside the Earth
billion years. We live on the cool thin skin of a planet that is still cooking.
Article · 4 min read
Matter, Energy & Physics
Light
skin; then X-rays, which pass through flesh but not bone; then gamma rays, the most
Article · 4 min read
