17 results for “weight”
The Human Body
The Skeleton and Bones
weight and shields the spinal cord while curving in an S that absorbs shock with every
Article · 5 min read
Matter, Energy & Physics
The Periodic Table
weight of each kind of atom. They also knew that some elements behaved alike. Lithium, sodium
Article · 4 min read
Matter, Energy & Physics
Gravity
weight is simply the Earth's spacetime curvature pressing you against the floor; in orbit, in free
Article · 4 min read
The Human Body
Muscles
weight they lift. Fast and slow Muscle fibres come in two main types. Slow fibres contract
Article · 4 min read
Planet Earth
The Atmosphere
Weight and pressure Air has weight. The whole column above a square metre of ground at sea level
Article · 4 min read
Animals
Birds
weight. Birds breathe through a system of air sacs that keeps fresh air flowing through the lungs
Article · 3 min read
Animals
Mammals
weight a day. In return, mammals can be active on cold nights and in cold places
Article · 4 min read
The Human Body
Lungs and Breathing
weight leaves your body this way: the fat is broken down, combined with oxygen, and breathed
Article · 4 min read
Animals
Animal Migration
weight of life on the move, nothing else comes close. Finding the way Migrating animals carry
Article · 4 min read
The Human Body
The Brain
weight but burns about a fifth of the body's energy, almost all as glucose, delivered
Article · 4 min read
The Human Body
Sleep and Dreams
weight gain, weaker immunity, heart disease and poorer mental health. Common sleep problems include insomnia, difficulty
Article · 3 min read
The Human Body
Digestion
weight, your immunity, your mood and your risk of many diseases, and the bacteria living in it, which
Article · 4 min read
Life & Biology
Bacteria and Viruses
weight exceeds that of all animals combined. They reproduce by splitting in two, some as often
Article · 4 min read
Plants & Fungi
Trees and Forests
weight, and all of it came from carbon dioxide in the air. The world's forests
Article · 4 min read
Space & the Universe
Space Exploration
weight at launch is propellant, and why rockets drop empty sections, called stages, as they climb
Article · 3 min read
Planets & the Solar System
The Sun
weight of everything above squeezes the core to 250 billion times the pressure of Earth's atmosphere
Article · 4 min read
Matter, Energy & Physics
Light
Light is a wave, a particle and the fastest thing there is. Everything you see is
Article · 4 min read
