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07:41

from Veritasium

Key Facts In This Video

  • 1

    When we're focused on something, we don't notice the time passing. That makes it seem shorter than it actually is. (3:10)

  • 2

    Our sense of how long something is correlates with how much energy our brains are using on it. Brain energy use peaks around age 5, which could be why time seems to speed up as we age. (4:14)

  • 3

    Being afraid and being bored both increase our perception of time. (4:50)

02:53

Key Facts In This Video

  • 1

    The rate at which time passes is constant, unless you're moving at a fraction of the speed of light. (0:14)

  • 2

    People tend to think that crescendoing sounds last longer than receding sounds. (1:23)

  • 3

    The superior temporal sulcus in the brain is involved in the perception of biological motion, and can inform you of threats before the fight-or-flight response kicks in. (2:08)

02:38

Key Facts In This Video

  • 1

    A fly can take in up to 7 times more audio and visual information per second than a human. (0:45)

  • 2

    In a particularly dangerous or stressful situation, our perception of time seems to slow. (1:26)

  • 3

    Flies, squirrels, and pigeons seem especially adept at taking in a lot of information at once. (1:58)

07:53
09:23

Key Facts In This Video

  • 1

    One nostril inhales and circulates air more efficiently than the other. (0:41)

  • 2

    Our bodies must constantly adjust how much smell we take in at once, as not to overload our senses. (4:47)

  • 3

    Smell and memories are closely linked. (5:34)

02:53

Key Facts In This Video

  • 1

    About 85% of humans breathe primarily out of one nostril at a time. (0:16)

  • 2

    One 1988 study showed that breathing through the right nostril raises blood glucose levels. (1:07)

  • 3

    When you sleep on your side, the nostril closest to the bed will swell, and you'll breathe out of the other one. (2:00)

02:49

Key Facts In This Video

  • 1

    About 8 out of 10 people have a nasal cycle, wherein one nostril is more swollen than the other. (0:30)

  • 2

    The nasal cycle allows the tiny hairs in the body's respiratory tract, called cilia, to recuperate. (1:12)

  • 3

    The nasal cycle increases the range of odors a nose can smell. (1:57)

03:29
02:41

Key Facts In This Video

  • 1

    Holding your pee is really only bad for you when you do it frequently and for a long time. (0:16)

  • 2

    If you’re an adult, your body can hold two full cups (about half a liter) of urine before you’ll feel the need to let it go. (0:26)

  • 3

    Long before your bladder could burst before from holding your pee too long, your body will likely ignore your brain trying to hold it in and you'll just wet yourself. (1:34)

03:53

from Thoughty2

Key Facts In This Video

  • 1

    When a nerve ending detects tissue damage, it sends a pain signal to the brain. (0:36)

  • 2

    When the body experiences enough pain, the central nervous system becomes overloaded, and the person passes out. (1:24)

  • 3

    Although pain can't kill you directly, going into circulatory shock as a result of pain can. (2:54)

03:28

Key Facts In This Video

  • 1

    There are special receptors in your body that respond specifically to pain called nociceptors. (0:20)

  • 2

    Non-steroidal anti-inflammatory drugs, such as ibuprofen, works by stopping the production of prostaglandins. (1:05)

  • 3

    Scientists still aren't completely sure on how acetaminophen works. (1:42)

02:57

Key Facts In This Video

  • 1

    Before aspirin was invented, people reduced fevers and inflammation by chewing the bark of the white willow tree. (0:04)

  • 2

    TNT is poisonous, and skin exposure to it will cause your skin to turn yellow or orange. (1:11)

  • 3

    Opiorphin is a chemical in human saliva that is more potent than morphine. (2:26)

02:36

Key Facts In This Video

  • 1

    Multiple surveys have shown that blue is the most popular response to "What is your favorite color?". (0:29)

  • 2

    Bulls aren't actually angered by the color red. (1:08)

  • 3

    School buses are yellow because it is the most attention-grabbing color when seen in our peripheral vision. (1:55)

02:51

Key Facts In This Video

  • 1

    The cones in the retina contain three types of photopigments that are sensitive to different wavelengths of visible light. (0:16)

  • 2

    The genes for red and green photopigments are located on the X chromosome, which is why more males are colorblind than females. (1:23)

  • 3

    Colorblindness doesn't mean that you see the world in shades of gray. (1:48)

03:52

Key Facts In This Video

  • 1

    Humans have three types of cone cells allowing us to see red, green, and blue. (0:47)

  • 2

    The number and type of cones distributed in peoples eyes vary greatly. (1:14)

  • 3

    A study in Animal Behavior found that diurnal organisms sleep better in bright blue light than in dim yellow light. (2:44)

02:05

from Neuroscientifically Challenged

Key Facts In This Video

  • 1

    CAT or CT Scans involve taking a series of X-ray images around the head and combining them to get an overall image. The resolution isn't very high, but they can be used to see major structural problems, like tumors. (0:13)

  • 2

    MRIs involve applying a combination of magnetic fields and radio-frequency energy waves to the brain, which cause hydrogen atoms to emit energy. The device reads this energy to create an image with higher resolution than a CT scan. (0:40)

  • 3

    fMRI uses a similar approach to MRI, but uses the contrasts between oxygenated and unoxygenated blood to identify changes of blood flow in the brain, and thereby identify its most active areas. (1:33)

02:05

from Neuroscientifically Challenged

02:00

from Neuroscientifically Challenged

02:00

from Neuroscientifically Challenged

02:01

from Neuroscientifically Challenged

02:03

from Neuroscientifically Challenged

01:57
02:40
02:33
01:15

from ScienceN60

02:57

from Stuff Mom Never Told You - HowStuffWorks

Key Facts In This Video

  • 1

    The word for the ability to grow a beard is pogonotrophy. (0:06)

  • 2

    Research shows that testosterone levels in men with full beards and men who don’t grow full beards are roughly the same. (0:50)

  • 3

    Men's facial hair growth is more mediated by genetics than testosterone. (1:19)

03:34

Key Facts In This Video

  • 1

    Testosterone causes all of the secondary sex characteristics generally found in men. (1:01)

  • 2

    Large, impressive beards grow due to genetics, not hormones. (1:24)

  • 3

    Shaving does not make a beard grow faster. (2:19)

03:49

Key Facts In This Video

  • 1

    The Vasper system is designed to provide the benefits of a two-hour workout in only twenty minutes. (0:10)

  • 2

    Astronauts who spend long amounts of time in space experience loss of strength in their muscles and bones. (1:16)

  • 3

    The Vasper system aims to increase the body's production of natural growth hormones by upping the concentration of lactic acid in the muscles. (2:03)

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