Explore questions from across science through evidence, mechanisms, limitations, and the explanations behind familiar claims.
Find an explanation ↓
Elephants are primarily prey animals, not predators. An adult elephant has no natural predator, but calves, and adults weakened by drought, injury, or poaching, are killed by lions, spotted hyenas, and wild dogs across Africa.
Read the story ↗Deadlifts are not inherently dangerous; they are dangerous in proportion to how much load you place on a spine that is not prepared for it, and the vast majority of injuries are muscular strains rather than spinal fractures.
Amino acids are the nitrogen-containing molecules that serve as the individual building blocks of proteins. Twenty standard amino acids, encoded by the genetic code, link through peptide bonds to form every protein in the human body.
Are dolphins smarter than octopuses? Not in any single measurable sense, because they are intelligent in different currencies.
Yes, third cousins are blood related, but only barely. Third cousins share a pair of great-great-great-grandparents and, on average, about 0.781 percent of their DNA, which works out to roughly 53 centimorgans across about 73 shared…
Lentils are both a carbohydrate and a protein food, and the label depends on which side of the plate you measure.
Yes, boiled eggs are healthy for most people. A large boiled egg delivers about 6.3 grams of complete protein, 72 calories, and 147 milligrams of choline for roughly USD 0.30, with no added fat because the shell seals the egg during…
Yes, grapes are high in sugar compared with most fruits, but "high in sugar" and "bad for blood sugar" are not the same claim.
Are foot cramps a sign of early pregnancy? They can be, but they are a weak and nonspecific one.
Adrenal insufficiency is a life-threatening hormone deficiency in which the adrenal glands cannot produce enough cortisol, and sometimes too little aldosterone, so the body loses its ability to maintain blood pressure, blood glucose, and…
Anthony Fauci’s role with AZT during the AIDS crisis was that of a clinical architect and bureaucratic broker, not the drug’s inventor.
Yes, camels and llamas are close relatives: both belong to the mammalian family Camelidae, the only living family in the suborder Tylopoda, and they share a common ancestor that lived in North America roughly 40 to 45 million years ago.
Yes, betta fish are aggressive, but not in the way most owners assume: male Siamese fighting fish (Betta splendens) are intensely territorial toward other males and toward anything that resembles a rival male, while females and juveniles…
Are eggs bad for chronic kidney disease? For most people with CKD, no — eggs are one of the better protein choices, not a forbidden food.
Yes, by most ecological scorecards, the domestic cat (Felis catus) is the most damaging invasive predator on Earth.
Baby brown recluses are venomous from the moment they hatch, but they are far less dangerous to humans than mature females.
Activated charcoal and regular charcoal are chemically the same material, but activated charcoal has been processed to open millions of microscopic pores, raising its internal surface area from roughly 50 square meters per gram to between…
Are buckthorn berries edible? It depends entirely on which buckthorn you mean, and that ambiguity is why so many foragers get sick.
Yes, boiled eggs are good for pregnancy when they are cooked until both yolk and white are fully firm, which eliminates the Salmonella risk that makes raw or runny eggs unsafe.
Compression socks can help a fractured foot, but only after the fracture has been stabilized and initial swelling has peaked, typically 3 to 10 days after injury.
Anorexia nervosa causes lasting damage long after weight normalizes, because the body prioritizes survival over structural repair for months to years.
Achondroplasia and hypochondroplasia are both caused by activating mutations in the FGFR3 gene, but they differ in severity, timing, and clinical impact.
Yes, abdominal aortic aneurysms (AAAs) are partly hereditary.
Glycine metabolism is the network of reactions that synthesizes, interconverts, and consumes the simplest amino acid, glycine (C₂H₅NO₂), which serves simultaneously as a protein building block, a one-carbon donor, a glutathione precursor,…
AI-generated editorial images · Image policy
Show Me