Most labs need about 1–2 grams of stool for an H. pylori test; a pea-to-thumbnail-size sample fills the vial line.

Your colon can store around 1–2 liters of stool and gas combined, while the rectum triggers the urge near the 250–300 mL mark.

The colon can hold several hundred milliliters, and the rectum usually triggers an urge near 300 mL, with tolerance up to roughly 400–500 mL in some adults.

Most adults can hold roughly 0.6–1.3 liters of colonic contents, while the rectum usually triggers an urge around 300 mL.

In eyeglass prescriptions, a normal spherical power centers near 0.00 diopters, with small shifts like ±0.50 D common.

No amount is safe—spoiled milk isn’t safe to drink; even small sips can trigger foodborne illness.

Even a bite of spoiled meat can make you sick; risk depends on germs, toxins, and your health.

With spoiled milk, any swallow can upset your stomach; risk depends on germs, dose, and your health.

No, saliva alone doesn’t transmit HIV; transmission needs blood or sexual fluids reaching mucous membranes or broken skin.