How Does the Human Eye Work?
The eye works like a living camera, bending light onto a light-sensitive screen at the back and sending signals to the brain. This guide…
Dr. Nadia Okoro
382 reading now
Dr. Nadia Okoro
Science & Health Writer
Dr. Nadia Okoro holds a PhD in molecular biology and writes about medicine, public health and scientific research with an emphasis on evidence.
Credentials: PhD, Molecular Biology
How Do Solar Eclipses Happen?
A solar eclipse happens when the Moon passes directly between the Earth and the Sun, casting its shadow on our planet. Here is the geometry…
Dr. Nadia Okoro
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How to Reduce Your Sugar Intake
Cutting back on sugar is one of the simplest ways to improve your diet, but it is easy to get wrong. Here is which sugars to focus on…
Dr. Nadia Okoro
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What Are Tectonic Plates?
Tectonic plates are the giant slabs of rock that make up the Earth's outer shell, drifting slowly over the hot interior. Here is how they…
Dr. Nadia Okoro
426 reading now
How to Care for Your Eyes (and Screen Health)
Eye care is about more than reading glasses. Here is how to look after your eyes day to day, what screen use really does to them, the truth…
Dr. Nadia Okoro
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What Is the Ozone Layer?
The ozone layer is a band of gas high in the atmosphere that absorbs most of the Sun's harmful ultraviolet radiation. Here is what it is…
Dr. Nadia Okoro
378 reading now
Blood Sugar Explained
Blood sugar is the glucose circulating in your blood, your body's main fuel. Here is how it works, what causes it to rise and fall, why…
Dr. Nadia Okoro
452 reading now
How Does GPS Work?
GPS pinpoints your location by timing radio signals from a fleet of satellites orbiting thousands of miles overhead. Here is the science of…
Dr. Nadia Okoro
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The Truth About 10,000 Steps a Day
The 10,000-steps target is famous, but it began as a marketing slogan, not a scientific finding. Here is where the number came from, what…
Dr. Nadia Okoro
477 reading now