Pencils cannot be used in space because the graphite dust and particles they generate pose fire, puncture and inhalation hazards in a low-gravity, high-oxygen environment, something even the Soviets acknowledged. The space pen was independently developed by Paul C. Fisher, founder of the Fisher Pen Company, with $1 million of his own funds. NASA tested and approved the pen for space use, then purchased 400 pens at $6 per pen. The Soviet Union subsequently also purchased the space pen for its Soyuz space flights.

Bulls are not enraged by the color red, used in capes by professional matadors. Cattle are dichromats, so red does not stand out as a bright color. It is not the color of the cape, but the perceived threat by the matador that incites it to charge.

In most cases, raising the arms and vocalising are impossible due to the instinctive drowning response. Waving and yelling (known as "aquatic distress") is a sign of trouble, but not a dependable one: most victims demonstrating the instinctive drowning response do not show prior evidence of distress.

This belief is due to hair that has never been cut having a tapered end, whereas after cutting the edge is blunt and therefore thicker than the tapered ends; the cut hair appears to be thicker and feels coarser due to the sharper, unworn edges. The shorter hairs being less flexible than longer hairs also contributes to this effect.

Detoxification diets "have no scientific basis", and are a "waste of time and money". Despite this, there is a common misconception that specific diets aid this process or could remove substances that the body is unable to remove by itself. Toxins are removed from the body by the liver and kidneys.

The melody used in "Twinkle, Twinkle, Little Star", the "Alphabet Song", and "Baa, Baa, Black Sheep" was not composed by Wolfgang Amadeus Mozart when he was 5 years old; it was already a popular French folk tune which existed for decades before Mozart composed a series of variations on the tune, when he was 25 or 26.

The Bible never claims a date of December 25 (he and his followers primarily used the Hebrew calendar, which as a lunisolar calendar does not have a day-to-day correspondence to the fully solar Roman calendar nor its modern-day descendant Gregorian calendar); contextual clues may imply a date in or around September. The fixed date is attributed to Pope Julius the First because in the year 350 AD he declared the twenty-fifth of December the official date of celebration. The date may have initially been chosen to correspond with either the day exactly nine months after Christians believe Jesus to have been conceived, the date of the Roman winter solstice, or one of various ancient winter festivals.

2.45 GHz microwaves can only penetrate approximately 1 centimeter (0.39 in) into most foods. The inside portions of thicker foods are mainly heated by heat conducted from the outer portions.

Their attack behaviors on humans and pinnipeds are very different: when attacking a seal, a great white shark surfaces quickly and violently attacks it. Attacks on humans, on the other hand, are more relaxed and slow: the shark charges at a normal pace, bites, and swims off. Great white sharks have efficient eyesight and color vision; the bite is not predatory, but rather for identification of an unfamiliar object.

Some mental functions, such as speech and language (such as Broca's area and Wernicke's area), tend to activate one hemisphere of the brain more than the other in some kinds of tasks. If one hemisphere is damaged or removed at an early age, these functions can often be recovered in part, or even in full, by the other hemisphere (see neuroplasticity). Other abilities, such as motor control, memory, and general reasoning, are served equally by the two hemispheres.

More than 99 percent of diamonds ever mined have formed in the conditions of extreme heat and pressure about 140 kilometres (87 mi) below the earth's surface. Coal is formed from prehistoric plants buried much closer to the surface, and is unlikely to migrate below 3.2 kilometres (2.0 mi) through common geological processes. Most diamonds that have been dated are older than the first land plants, and are therefore older than coal. It is possible that diamonds can form from coal in subduction zones and in meteoroid impacts, but diamonds formed in this way are rare and the carbon source is more likely carbonate rocks and organic carbon in sediments, rather than coal.

This misconception was probably promulgated by Pliny the Elder (23–79 CE), who wrote that ostriches "imagine, when they have thrust their head and neck into a bush, that the whole of their body is concealed."

Such entities can still use information such as IP addresses and user accounts to uniquely identify users.

Despite the urban legend that calculations show that they should not be able to fly, the flight mechanism and aerodynamics of the bumblebee (as well as other insects) are actually quite well understood. In the 1930s, the French entomologist Antoine Magnan indeed postulated that bumblebees theoretically should not be able to fly in his book Le Vol des Insectes (The Flight of Insects). Magnan later realized his error and retracted the suggestion. However, the hypothesis became generalized to the false notion that "scientists think that bumblebees should not be able to fly".

Specialized malware designed to attack macOS and Linux systems do exist.

The myth comes from a misconstruction of Franz Boas's original statement noting that Eskimos had a variety of words for various snow-related concepts; Boas noted that the same was true of English.

Only a limited number of earthworm species are capable of anterior regeneration. When such earthworms are bisected, only the front half of the worm (where the mouth is located) can feed and survive, while the other half dies. Some species of planarian flatworms, however, actually do become two new planarians when bisected or split down the middle.

In a study in a laboratory at the University of Central Arkansas, it was observed that 1 out of 45 times the female ate the male before mating and the male ate the female with that same frequency.

The last of the non-avian dinosaurs died 66 million years ago in the course of the Cretaceous–Paleogene extinction event, whereas the earliest members of genus Homo (humans) evolved between 2.3 and 2.4 million years ago. This places a 63-million-year expanse of time between the last non-bird dinosaurs and the earliest humans. Humans did coexist with woolly mammoths and saber-toothed cats—mammals often erroneously depicted alongside humans and dinosaurs.

In fact, typical protein intakes of ovo-lacto vegetarians and vegans meet and exceed requirements. However, a vegan diet does require supplementation of vitamin B12 for optimal health.

While about 70 percent of bat species, mainly in the microbat family, use echolocation to navigate, all bat species have eyes and are capable of sight. In addition, almost all bats in the megabat or fruit bat family cannot echolocate and have excellent night vision.

The concepts of theory and hypothesis have specific meanings in a scientific context. While theory in colloquial usage may denote a hunch or conjecture, a scientific theory is a set of principles that explains observable phenomena in natural terms. "Scientific fact and theory are not categorically separable", and evolution is a theory in the same sense as germ theory or the theory of gravitation.

While it is true that a person may be confused or disoriented for a short time after awakening, this does not cause them further harm. In contrast, sleepwalkers may injure themselves if they trip over objects or lose their balance while sleepwalking.

The order in which different types of alcoholic beverages are consumed ("Grape or grain but never the twain" and "Beer before wine and you'll feel fine; wine before beer and you'll feel queer") does not affect intoxication or create adverse side effects.

It's far shorter than the common (and somewhat jocular) myth that Twinkies are edible for decades or longer. They generally remain on a store shelf for only 7 to 10 days

The bumps on a toad are not warts. Warts on human skin are caused by human papillomavirus, which is unique to humans.

They will draw objects nearby towards them, just as any other planetary body does, except at very close distances to the black hole. If, for example, the Sun were replaced by a black hole of equal mass, the orbits of the planets would be essentially unaffected. A black hole can act like a "cosmic vacuum cleaner" and pull a substantial inflow of matter, but only if the star from which it formed was already having a similar effect on surrounding matter.

One study shows a correlation between alcohol consumption and drowning, but there is no evidence cited regarding the consumption of food or stomach cramps.