Marijuana is a preparation of the Cannabis sativa plant intended for use as a psychoactive drug, medicine and more rarely as religious or spiritual ingredient. It includes the dried leaves, flowers, stems, and seeds from the hemp plant. Its main active component is tetrahydrocannabinol (THC); one of 483 known compounds in the Cannabis plant, including […]
Predation is a biological interaction between a hunting organism, the predator, and another organism that is hunted, the prey. Predators may hunt actively for prey in pursuit predation, or sit and wait for prey as in ambush predators. In all cases, it is a complex behavior requiring honed skills and perfect and fast coordination among […]
Pigmentations are among the clearest examples of phenotypic variation in many species. Hair, skin and eye colors are highly heritable and visible traits in humans. Blond hair is most commonly found in Northern and Central Europeans and their descendants. Nowadays it can be found spread in many parts of the world but it is particularly […]
Many women mention to have memory lapses, cognitive impairment and difficulties to focus associated to pregnancy and motherhood. It is called «baby brain», «brain pregnancy» or «momnesia». In surveys, up to four-fifths of pregnant women report slight mental troubles such as problems remembering phone numbers or stringing a complex sentence together. It is considered a […]
Researchers do not know what influences have the stereotypical images of scientists, if any, on children’s perception of science. The most common technique for assessing children’s perceptions of scientists is the Draw-a-Scientist Test (DAST). David Wade Chambers firstly proposed it in 1983 , and its main aim was to identify at what age the stereotypic […]
Flavor is a brain construction: we have olfactory and taste receptors and our central nervous system combines both types of information in what we call flavor. Malaria is an infectious disease affecting humans and other animals caused by parasitic protozoans belonging to the Plasmodium genre. It is transmitted by the bite of the female Anopheles […]
Group activities like dancing, laughing, and singing, release endorphins in the brain. These endogenous opioid neuropeptides produce a feel-good sensation, increase pain tolerance acting as analgesics, and presumably help to form stronger bonds between members of the group. One conceivable explanation for our amusement of comedy might be that it makes us laugh, and thus […]
Autism spectrum disorders are a group of developmental disorders that cause lifelong disabilities. They affect people’s ability to communicate, to interact with others and to understand social cues. Affected persons have difficulties recognizing body language, making eye contact, and understand other people’s emotions, symptoms that hurt the individual’s ability to function socially, at school or […]
Cataglyphis , the desert ant, is a genus in the subamily Formicinae. The most famous species is C. bicolor , the Sahara Desert ant. There, the midday sun is so hot that even the permanent residents, sand lizards, insects and a few birds, have to take shelter. But this is when, for not much than […]
Whiskers or vibrissae are a type of mammalian hair characterized, anatomically, by their larger, thicker and stiffer morphology, large and well-innervated hair follicle and by having a definite projection in the somatosensory cortex of the brain, forming the so-called “barrels”. The ‘barrels’ of the barrel field are regions within cortical layer IV that are visibly […]