What Is Gravity?
Gravity is the attraction between anything that has mass, from an apple to a galaxy. Here is how Newton and Einstein each explained it, why…
Dr. Nadia Okoro
408 reading now
Science
Research, discovery and the natural world — from the cosmos to the cell.
184 stories
How Do Telescopes Work?
Telescopes work by gathering and focusing light to make distant, faint objects appear brighter and bigger. This guide explains refractors…
Dr. Nadia Okoro
474 reading now
The Big Bang, Explained
The Big Bang is the leading scientific explanation for how the universe began: not an explosion in space, but the expansion of space itself…
Dr. Nadia Okoro
362 reading now
Antibiotic Resistance Explained
Antibiotic resistance is when bacteria evolve so that the drugs meant to kill them stop working. Here is how it develops, why the World…
Dr. Nadia Okoro
388 reading now
What Is Electricity?
Electricity powers nearly everything we use, yet few of us could say what it actually is. This guide explains electric charge, current…
Dr. Nadia Okoro
439 reading now
How Do Magnets Work?
Magnets pull and push without touching, yet the reason why is rooted in the behaviour of electrons. This guide explains magnetic fields…
Dr. Nadia Okoro
392 reading now
What Is Radioactivity?
Radioactivity is the natural process where unstable atoms shed energy as radiation. This guide explains the types of radiation, what…
Dr. Nadia Okoro
405 reading now
What Is the Scientific Method?
The scientific method is the step-by-step approach scientists use to test ideas against evidence. This guide explains how it works, why…
Dr. Nadia Okoro
358 reading now
Comets, Asteroids and Meteors: What's the Difference?
Comets, asteroids, meteoroids, meteors and meteorites are easy to confuse. This guide explains what each one is, what they are made of…
Dr. Nadia Okoro
330 reading now