ScienceFriendly introductions to questions from across science. Start with something familiar, discover the explanation, and keep exploring.
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Yes—with an important caveat. Large prospective studies show that people with higher circulating branched-chain amino acids (BCAAs: leucine, isoleucine, valine) have roughly 1.5 to 2 times the risk of developing type 2 diabetes over 5 to…
Read the story ↗Yes, humans are genuinely capable of altruism, but the capacity is conditional, not constant.
Let's find outRaw acorns are mildly poisonous to humans and dogs, and seriously poisonous to horses and cattle. The toxin is tannic acid and related hydrolyzable tannins, concentrated at 4 to 9 percent of the nut's dry weight.
Let's find outYes, insects are animals. Insects belong to the kingdom Animalia, the class Insecta within the phylum Arthropoda, and they share with all other animals the defining traits of multicellularity, specialized tissues, and heterotrophy, meaning…
Let's find outAre cats easy to take care of? Yes, relative to most pets, and the honest reason is behavioral: a healthy adult cat needs roughly 15 to 30 minutes of active human attention daily, self-regulates its own eating and elimination, and…
Let's find outAre gorditas healthy? As a general rule, no — not by default.
Let's find outNo, horses and donkeys are not the same species. A horse (Equus ferus caballus) carries 64 chromosomes; a donkey (Equus africanus asinus) carries 62.
Let's find outNo, honey locust thorns are not poisonous in the usual sense: they carry no venom, inject no toxin, and are not coated in a chemical irritant. The genuine danger is purely mechanical.
Let's find outGreen lynx spiders are venomous but not poisonous: their venom is delivered by bite into prey or skin, not absorbed by eating them, and it is medically minor for humans.
Let's find outYes, hernias are common in puppies, but the word "common" hides a huge split.
Let's find outYes, grapes can support weight loss, but only under specific conditions: they deliver about 62 calories per 100 grams, roughly 16 grams of sugar, and 0.9 grams of fiber in a high-volume, high-water package.
Let's find outYes — for most people with type 2 diabetes, hard-boiled eggs are a good food. A single large hard-boiled egg delivers about 6.3 g of complete protein and roughly 0.5 g of carbohydrate, which means it barely touches blood glucose.
Let's find outChimpanzees and gorillas are differently smart rather than one being smarter overall: chimps outperform gorillas in social learning, tool use, and working memory, while gorillas hold their own in emotional intelligence, spatial reasoning,…
Let's find outYes, gametes are haploid: a mature human egg or sperm carries one complete set of 23 chromosomes, half the 46 found in a somatic cell.
Let's find outFor most healthy adults, horror movies are not bad for mental health. Controlled fear in a safe setting can raise heart rate to 100-160 bpm and spike cortisol for 20-90 minutes, then return to baseline with no lasting harm.
Let's find outYes, graveyard shifts are unhealthy for most people, though the damage is dose-dependent rather than inevitable.
Let's find outYes, your eyes and nose are connected through a small, one-way drainage channel called the nasolacrimal duct, which runs from a tiny opening at the inner corner of each eyelid down into the nasal cavity's inferior meatus.
Let's find outNo, hazel eyes are not green, though they share green as one component.
Let's find outYes, goldfish are schooling fish, but not in the strict, obligate sense that many saltwater species are.
Let's find outYes — eggs are a genuinely excellent protein source, but the reason is quality rather than quantity.
Let's find outYes, figs are inverted flowers. The fig you eat is a hollow, pear-shaped stem structure called a syconium, and its inner wall is lined with hundreds to thousands of tiny flowers that bloom entirely enclosed.
Let's find outAre dog breeders bad? Not inherently, no. Whether a breeder is harmful depends almost entirely on practice, not on the label.
Let's find outYes, dark chocolate almonds can be good for you, but only under specific conditions: the chocolate must be 70% cacao or higher, the almonds should dominate the weight, and the portion must stay near 1 ounce (about 28 g) per day.
Let's find outEggs are not bad for the liver in most people. For a healthy adult, eating one egg a day has not been shown to cause liver damage, and the liver regulates cholesterol far more than dietary cholesterol does—about 80% of blood cholesterol is…
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