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What Is Ultraviolet Light? | Live Science
UV radiation and sunburn
A suntan is a reaction to exposure to UVB rays. When the body senses sun damage, it sends melanin, a pigment in the body, to absorb UV light and protect the body from more damage, resulting in a darkened skin.
Continued exposure to UV radiation can damage the body's DNA. When the body senses this destruction, it floods the area with blood and inflammation to help with the healing process. Sometimes the cells with DNA mutated by the sun's rays turn into problem cells, known as skin cancer.
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Misophonia
Misophonia is characterized by strong negative emotions such as anger and anxiety in response to everyday sounds other people make. These sounds include humming, chewing, t...
Misophonia and brain particularities
Scientists do not fully understand misophonia but suspect it's caused by the way some people's brains process particular sounds and react to them.
Some studies found that the brains of people with misophonia showed hyperactivation of the salience network, a group of brain areas that direct our attention to important things in our surroundings. Trigger sounds send the salience network into an overdrive. Researchers found these brain areas are structurally more robust in people with misophonia.
Calming a misophonic brain
There's a lot of similarity between people who experience misophonia, but also a lot of diversity.
Therapists use a variety of techniques that is often based on the symptoms. Those who experience fear and anxiety may respond to exposure-based treatments. Those who experience anger can learn to manage their distress through distraction or relaxation techniques.
My Red Is Your Blue
About 1 per cent of American men suffer from red-green colour blindness.
Recent experiments challenge the accepted notion that all of us have the same default perception o...
The Calculations Of Light
- The colour-sensitive receptors that humans have, called melanopsin, measure the amount of blue or yellow light in the atmosphere and likewise regulate our circadian rhythm.
- Human beings have Cone Cells, which are of three types, Red, Blue, and Green, and have evolved much later than the receptors in the brain.
Colour Is A Private Sensation
- Research proves that the universal emotional responses that we have when we see a colour tend to be the same, even if the actual colour is different, as our conscious perception of those colours varies.
- The day-night cycle of living things is impacted by the ambient light, where the morning yellow light awakens us or makes us feel happy, and the dominance of blue light at night makes us feel sleepy.
Asteroids
- Asteroids are rocks which revolve around the sun. They are usually too small to be considered as a planet since they can be as small as 2 meters but they can be as big as 94...
The formation of asteroids
Asteroids are what's left after the formation of our solar system from billions of years ago.
It is believed that the reason why they were formed were because of the birth of Jupiter. Its birth hindered any planetary bodies to form in the space between Mars and Jupiter, which resulted to the small objects that were present to crash onto each other and fragment themselves.
The two theories that back this up are the Nice model and the Grand Tack.
Categorizing asteroids
The different types of asteroids are:
- Main belt asteroids - Lies in between Mars and Jupiter; holds more than 200 asteroids
- Trojan asteroids - found outside the main belt; usually orbits larger planets
- Near-Earth asteroids (NEAs) - circles close to earth; there are three types of NEAs, Apollo, Aten, and Atira
- The C-type - carbonaceous asteroids
- The S-type - silicaceous asteroids
- The M-type - metallic asteroids
- The V-type - has a basaltic and volcanic crust