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MRI is a technique used to diagnose diseases and to study the body. The machine can map internal structures, all the way down to tiny blood vessels.
Some atoms and molecules have a positive or negative electrical charge. These are called ions.
Liquid fuel sources such as natural gas and petroleum form deep underground between layers of rock. To retrieve them, engineers often use a technique called hydraulic fracturing, or fracking.
A gravitational lens is an effect that occurs when a massive object lies between a viewer and something further away. The massive object’s gravity bends light arriving from the more distant object.
This is a chemical that travels in the blood and acts as a signal. It can tell distant body parts what to do. When a chemical acts in this way, it has a special name.
Bits of plastic smaller than five millimeters are called microplastics. They can end up in the ocean, where corals might mistake them for food.
Nematodes are a group of related small worms found all over the world. They can cause disease, but they also can be useful for scientists to study.
Sometimes populations of animals can suddenly increase. The word for that is irruption.
When lightning strikes in the right place, it can fuse minerals together in a glassy structure.
If you draw a representation of your body as seen by your brain, it’s called a homunculus. On it, parts sensitive to touch or used for fine movement are large, while others are small.
We often feel the pull of sleep when the sun goes down. Light and our own biology put us into a regular, 24-hour rhythm that has its own word.
Blood can contain nasty bacteria and other things you want to keep away from your delicate brain. The blood-brain barrier is up to the job.