Ideas

Mentos react with soda because their rough surface lets dissolved carbon dioxide escape fast, creating a geyser. The reaction Mentos have a rough, pitted

The US Constitution (Article II) requires a president to be at least 35 years old, because the framers wanted maturity and experience. Rule Article II

Amtrak Business class offers more legroom, a free non-alcoholic drink, and priority boarding compared with Coach. Coach Standard seat. Pay for food.

Breastfeeding provides nutrition and antibodies for babies, lowers infection risk, and supports bonding, and it also has health benefits for the mother.

A car’s AC smells bad because of mold or bacteria on the evaporator, a clogged drain, or a dirty cabin air filter. Replace the filter and use an AC cleaner.

Shoulder pain lifting the arm is often caused by rotator cuff problems, impingement, or bursitis. See a doctor if it persists. Common causes Rotator cuff

Hair tangles easily when it is dry, damaged, long, or rough at the cuticle, and when it rubs against clothing or sheets. Common causes Dry or damaged hair

Pepto-Bismol turns the tongue black because the bismuth reacts with sulfur in saliva, forming harmless bismuth sulfide. It fades in a few days.

Don’t pop a stye. It can spread the infection. Use a warm compress several times a day, and see a doctor if it doesn’t improve. Don’

Hand veins pop out due to low body fat, heat, exercise, or age. It is usually harmless. Why Low body fat makes veins more visible. Heat widens veins.