ScienceDirect answers to clear questions, with useful examples and context.
438 articlesYes, you can be allergic to cats, and the culprit is a small protein rather than the hair itself. Roughly 10 to 20 percent of adults worldwide react to Fel d 1, a 38-kilodalton protein produced mainly in cat saliva and sebaceous glands.
Let's find outApproach-avoidance conflict is the psychological state in which one goal simultaneously pulls you toward it and pushes you away, and your behavior stalls until one force wins.
Let's find outKnuckles are joints, not bones. Specifically, each knuckle is a synovial joint — a gap where two bone ends meet inside a fluid-filled capsule — and in the fingers these are called metacarpophalangeal (MCP) and interphalangeal (IP) joints.
Let's find outGrapes are a low-to-moderate potassium fruit, not a high-potassium one.
Let's find outHot flashes are not a recognized early sign of pregnancy. The typical early-pregnancy heat sensation is a mild, sustained rise in basal body temperature of roughly 0.5 to 1.0 degrees Fahrenheit, driven by progesterone and lasting past the…
Let's find outAmoxicillin is a broad-spectrum aminopenicillin antibiotic that kills bacteria by binding penicillin-binding proteins and blocking cell-wall construction, at standard adult doses of 500 mg every 8 hours or 875 mg every 12 hours.
Let's find outNo, being in heat is not inherently painful for cats. Estrus is a hormonally driven reproductive phase, not a disease state, and the behavior owners interpret as suffering is courtship signaling driven by estrogen and rising progesterone.
Let's find outNo. Intrusive thoughts are not a sign of schizophrenia on their own — they are near-universal, with roughly 94% of adults reporting at least one unwanted intrusive thought in a given year, while schizophrenia affects about 0.3% of people…
Let's find outCoachwhip snakes are not venomous, and no antivenom exists because none is needed. They are non-venomous colubrids that kill by constriction and jaw pressure, not injected toxin.
Let's find outYes, dogwood berries are mildly poisonous to humans and pets, but the real risk depends on which dogwood species you are dealing with.
Let's find outAre baths good for a fever? A lukewarm bath can help a feverish person feel more comfortable, but it does not lower the body's internal core temperature and the evidence base for "fever baths" is weak.
Let's find outAre kiwis extinct? No. All five recognized kiwi species survive in the wild as of 2026, but every one of them is declining or at best stable, and none is safe.
Let's find outAmorphous sediment in urine refers to shapeless, granular material—mostly amorphous urates, phosphates, or drug precipitates—that forms when urine is concentrated or its pH shifts, and it is almost always harmless and clinically…
Let's find outFor most adults, pills are the better default for vitamins, because they deliver more accurate doses, allow more nutrients per serving, and cost far less per dose; gummies win only when swallowing difficulty or adherence is the real…
Let's find outNo, fleas are not invisible. An adult flea measures about 1.5 to 3.3 millimeters long, which is roughly the width of a grain of rice, and it is plainly visible to healthy human eyes at rest.
Let's find outBabies do not breathe air in the womb. The fetus receives all its oxygen through the placenta, which transfers oxygen from maternal blood across a membrane roughly 0.002 millimeters thick into fetal circulation.
Let's find outThe Arctic dandelion is a cold-adapted perennial of the genus Taraxacum that survives the high Arctic through a three-part mechanism: a deep taproot that stores energy below the frost line, a compressed rosette that traps heat within 2–3…
Let's find outCamel spiders are neither poisonous nor venomous. Solifugae, the order containing roughly 1,100 species sold in search results as "camel spiders," have no venom glands and no venom-delivering fangs.
Let's find outCrepe myrtle flowers are not toxic. The blossoms of *Lagerstroemia indica* and its hybrids contain no known toxins, and no human poisoning case has been documented from eating them.
Let's find outMost antidepressants raise serotonin or norepinephrine; only three drug classes reliably increase dopamine signaling in humans.
Let's find outYes, amino acids are good for you—they are the molecular building blocks your body uses to make proteins, enzymes, hormones, and neurotransmitters, and nine of the twenty standard amino acids must come from food because your body cannot…
Let's find outAmitriptyline is a tricyclic antidepressant sometimes prescribed off-label for cats, most often at 0.5 to 2 mg per pound (1 to 4 mg/kg) given once or twice daily by mouth.
Let's find outAnorectal health issues in the elderly are common, underreported, and largely mechanical: aging weakens the pelvic floor, thins the anal sphincter, slows colonic transit, and adds medications that harden or loosen stool.
Let's find outAntifungal resistance in Candida glabrata and Candida krusei is primarily intrinsic or rapidly acquired resistance to fluconazole, driven by efflux pump overexpression and target-site mutations, and it is the main reason these two species…
Let's find outYes, Barbados cherry seeds are technically edible and not toxic, but you should not eat them whole or in quantity.
Let's find outNo, daisies are not chrysanthemums. A daisy is typically a common name for species in the aster family such as the oxeye daisy (*Leucanthemum vulgare*), while a chrysanthemum is a distinct genus (*Chrysanthemum*) within that same family.
Let's find outNo, a lamb and a sheep are not the same thing: lamb is a young sheep under 12 months of age, while "sheep" is the species (Ovis aries) and, in common usage, an adult animal over one year old.
Let's find outNo, CBD and delta-8 THC are not the same thing. CBD is a non-intoxicating cannabinoid that does not activate the CB1 receptor enough to produce a high, while delta-8 THC is a mildly intoxicating psychoactive cannabinoid that does.
Let's find outYes, cats are capable of love, but the word describes a different biological suite than human romantic love.
Let's find outBell peppers are perennials grown as annuals in most gardens. Botanically, Capsicum annuum is a short-lived perennial shrub that can live two to six years in frost-free climates.
Let's find outNo — ladybugs as a whole are not endangered. The family Coccinellidae contains roughly 6,000 described species worldwide, and the large majority remain common or unassessed.
Let's find outFor most healthy adults, daily supplements are not necessary and, in several well-documented cases, cause harm.
Let's find outDigital dentures are better than traditional ones for most patients on fit consistency, number of office visits, and repairability, but not universally better on cost, same-day speed, or the look of a hand-layered prosthesis.
Let's find outYes, dahlia tubers are edible, but with strict limits that most sources fail to state.
Let's find outDaffodils are good for pollinators, but not in the way most gardeners assume.
Let's find outCar seat inserts are safe only when they ship with the seat from the manufacturer and are used exactly as the manual directs.
Let's find outAre camel spiders dangerous? No. A camel spider is not venomous, has no venom glands, and cannot kill or seriously injure a human. It has no stinger and no fangs that inject toxin.
Let's find outNeuroscience is the study of how the nervous system produces behavior, thought, and emotion, and it rests on one core principle: neurons compute by converting chemical and electrical signals into decisions.
Let's find outAnemone size varies enormously by species: most aquarium and tide-pool anemones reach 1 to 12 inches (2.5 to 30 cm) across the oral disc, with giants such as Stichodactyla gigantea and the cold-water Urticina columbiana exceeding 3 feet…
Let's find outAre intense emotions bad? Not in themselves, and the framing hides the variable that actually matters. Harm tracks duration, recovery, and frequency far more than amplitude.
Let's find outHammerhead worms are poisonous, but not in the way most people fear. No land planarian, including *Bipalium* species, has a working venom gland that can inject a human, and there has never been a confirmed human fatality from one.
Let's find outAltitude sickness in kids is the body's reaction to low oxygen at high elevation, and it can begin in children as young as infants within 1 to 12 hours of ascent.
Let's find outAdult circumcision in the United States typically costs USD 1,500 to USD 4,500 when performed in a hospital operating room under general anesthesia, while an office-based procedure under local anesthesia usually runs USD 300 to USD 1,200.
Let's find outAm I going insane? In the overwhelming majority of cases, no. The sensation of "losing your mind" is usually a false alarm fired by an anxious nervous system, not a sign of emerging psychosis.
Let's find outAmmonia symptoms are the neurological and gastrointestinal signs caused by excess ammonia (NH₃) in the blood, which is measured as blood ammonia nitrogen and becomes clinically significant above roughly 50 μmol/L in adults.
Let's find outAn all breed pedigree is a documented ancestry record maintained by a registry that accepts multiple breeds rather than one, and it traces a dog's lineage through registered sires and dams, typically across three to five generations.
Let's find outAcid reflux is the backward flow of stomach contents past the lower esophageal sphincter (LES), the one-way valve at the junction of esophagus and stomach. When that reflux produces burning behind the breastbone, it is called heartburn.
Let's find outAmbien (zolpidem) side effects range from next-day drowsiness and dizziness to sleepwalking, sleep-driving, and complex sleep behaviors that can occur with no memory of them.
Let's find out