Scientists Say
A weekly word defined, in a sentence and in context. Click here to find the alphabetized list.
- Animals
Scientists Say: Hertz
Frequency is how often something repeats over a period of time. Frequency is often measured in hertz, the number of times a cycle repeats each second.
- Physics
Scientists Say: Big Bang
The Big Bang is the current theory about how our universe came to be. It began with a vast explosion of matter — a very Big Bang.
- Life
Scientists Say: Mitosis
Mitosis is a type of cell division where one cell divides into two identical copies, called daughter cells.
- Animals
Scientists Say: Hagfish
Hagfish are eel-shaped fish with many traits that make them similar to long-vanished fossils. When threatened, they can pump out piles of slime.
- Health & Medicine
Scientists Say: Obesogens
The chemicals can change how the body stores fat or how often someone feels hungry — increasing the risk for obesity.
- Climate
Scientists Say: Eyewall
The calm center of a hurricane or other tropical cyclone is called the eye. But the worst winds and rain are around it, in the eyewall.
- Chemistry
Scientists Say: Ferrofluid
Ferrofluids are liquids with tiny magnetic particles in them. These liquids respond to magnets.
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Scientists Say: Naloxone
This drug can save people who have overdosed on opioids, such as fentanyl and oxycodone.
- Physics
Scientists Say: Light pollution
Light pollution is when artificial light shines into places that are normally dark. It can disrupt the lives of plants, animals and people.
- Health & Medicine
Scientists Say: Myopia
Myopia is nearsightedness, where people have trouble seeing far away objects. This happens if someone’s eyes are slightly oval, instead of perfect spheres.
- Health & Medicine
Scientists Say: Neutrophil
Neutrophils are the first cells to arrive when an infection takes hold. They can trap, eat and spew out chemicals that fight bad bacteria.
- Animals
Scientists Say: Guinea worm
Scientists and health care workers are working to eradicate this parasite, which causes a painful condition called Guinea worm disease.
