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A Moment of Science

The Limits Of Teacher Assessments

Dodany: 20 listopada 2019

More and more, education is relying heavily on standardized tests. New research suggests that teachers assessments may be a more effective alternative.

Insect Navigation

Dodany: 18 listopada 2019

Insects are able to tell east from west using the sun. While it's hard to study insect brains to figure out exactly how they can tell compass direction using sunlight, a group of scientists used a...

Fire Over Chelyabinsk

Dodany: 15 listopada 2019

In 2013 a small asteroid about 60 feet across entered Earth's atmosphere traveling at 12 miles per second over a populated area of central Russia.

Koalas Have Fingerprints, Too

Dodany: 15 listopada 2019

Common knowledge states that every person’s fingerprint is unique. While this has never been strictly proven, there’s something special about the whorls and ridges at the ends of our fingers.

Don't Believe Your Fingers

Dodany: 14 listopada 2019

Cross your fingers and experience an illusion involving the sense of touch, on this Moment of Science.

The Ancient Riddle Of Geometric Increase

Dodany: 13 listopada 2019

If you calculate the geometric growth of the number two, you quickly come to an incredibly large number.

Computing With Light

Dodany: 12 listopada 2019

Computers would be much faster, smaller, and consume less energy if they used light signals instead of electrical signals. That's why many scientists are racing to figure out how to make computers...

A Rock In A Rowboat

Dodany: 11 listopada 2019

Imagine you're in a rowboat, in a small pond. You have a huge boulder with you in the boat. You throw the boulder overboard into the water. Does the water level of the pond rise, fall, or stay the...

Grapefruit Juice And Medicine

Dodany: 7 listopada 2019

Experiments have shown that drinking grapefruit juice while taking drugs to control cholesterol, for example, can hamper the metabolizing process and allow too much of the drug to enter the...

Waking Up Sleeping Bacteria

Dodany: 7 listopada 2019

Bacteria may not sleep the way humans do, but bacteria called "persisters" can fall into something like a deep sleep in which they shut down and aren't affected by antibiotics. They can wake up...

Is Coral A Plant Or An Animal?

Dodany: 6 listopada 2019

As larvae, corals are called planulae, and are free-swimming. An individual mature coral animal is called a polyp. If they are born a free-swimming creatures, how do they attach to become a reef?

Saguaro Boot

Dodany: 4 listopada 2019

When a saguaro cactus dies, its flesh decays, leaving behind the woody skeleton that supported the plant. What also remains are boot-like structures, called saguaro boots. It’s the combined...

Sort Nuts By Shaking The Can

Dodany: 31 października 2019

If you shake a can of mixed nuts for a few seconds, the largest nuts come to the top. The spaces between nuts are not big enough for small nuts to fall through, but the small nuts end up on the...

Why Is The Sky Blue?

Dodany: 31 października 2019

As common as the question is, explaining why the sky is blue is not as simple. It requires an understanding of the physics of light.

The Great Atlantic Sargassum Belt

Dodany: 31 października 2019

In the north Atlantic, there is an enormous bloom of Sargassum seaweed. It is wreaking ecological and economic havoc along coastlines in the tropical Atlantic, the Caribbean Sea and the Gulf of...

Alligator Hearts Thrive With Less Oxygen

Dodany: 30 października 2019

Some alligators can run much faster than you might think. Even more surprising is how alligators atain physical fitness. Unlike humans, alligators that get less oxygen when they are still in an egg...

Vitamines and Vitamins

Dodany: 29 października 2019

In 1912 a Polish biochemist, Casimir Funk, identified substances within food that were vital for a healthy diet, so Funk called them vital amines, or vitamines.

The Massive Migration Of The Hoverfly

Dodany: 28 października 2019

What do wildebeest, humpback whales and Canada geese all have in common? They all partake in huge migrations as the seasons change.

Too Smart For Their Own Good?

Dodany: 25 października 2019

Some of the ways we use devices like smartphones may present risks that aren't so apparent. For example, gauging if or when people overuse their devices presents challenges. 

How Plants Survive In The Desert

Dodany: 24 października 2019

Succulent plants such as cacti, aloes and agaves beat the dry heat of the desert by storing plenty of water in their roots, stems or leaves. They're able to do this because when it does rain,...