What Lies Do People Believe That Sound Smart?

TL;DR

Glass is not a slow moving liquid, and the popular window myth is debunked by medieval craftsmanship choices. Water is not inherently dangerous because of pure water but because of dissolved minerals in it. The video debunks ten common myths using simple physics and everyday observations, ending with practical truths you can rely on.

Transcript

Let's get right into it. Number 10, glass is a slow-moving liquid. You've heard that old church windows are thicker at the bottom because glass is a slow-moving liquid flowing downward over centuries. It sounds scientific. It's also completely wrong. Medieval glassmakers were just not great at making perfectly flat glass. They would spin molten gla... Read More

Key Insights

• Glass is not a slow moving liquid; medieval glass choices created thicker bottoms, not flow.
• Water conducts electricity due to dissolved ions, not pure water, making impure water dangerous.
• The deadly penny drop is limited by air resistance, reaching a harmless terminal velocity around 25 mph.
• Hair and nails do not grow after death; dehydration exposes more nail and hair.
• There is gravity in space; astronauts float due to free fall in orbit.
• The 24 hour missing person rule is a myth; immediate reporting improves outcomes.
• Mount Everest is not the sole tallest by all metrics; Chimborazo and Mauna Kea win under other measurements.
• Space is not completely silent; low frequency waves create measurable sounds.

Questions & Answers

Q: How is the glass bottom thickness explained if not by flow?

The bottom thickness of medieval glass panes comes from making wheels and discs of molten glass that are then cut into panes. Practically, builders placed the thick part at the bottom to stabilize the window, not because glass gradually flowed over centuries. The myth ignores the actual manufacturing process and the geometry of the glass disk.

Q: Why does water conduct electricity if pure water does not?

Pure water is a poor conductor because it lacks ions. When minerals, salts, or pipe particles dissolve in water, they release ions that carry charge. Therefore, the safety risk in water comes from dissolved impurities, not the water itself. Seawater conducts electricity much more readily due to its high salt content.

Q: What actually limits a penny’s speed when dropped from height?

A penny reaches a terminal velocity due to air resistance, which prevents further acceleration. From the Empire State Building, it would only reach about 25 miles per hour by the time it hits the ground, causing a sting but not a lethal impact. This demonstrates how air drag dominates small, flat objects.

Q: Do hair and nails grow after death?

No, hair and nails do not grow after death. What happens is that the body dehydrates and the skin retracts, exposing more of the nail and hair that were already present. This gives the illusion of growth, while in reality the metabolic processes required for growth have ceased.

Q: Why do astronauts seem weightless though gravity exists in space?

Astronauts appear weightless because they are in free fall orbit around Earth. They and the International Space Station are falling toward Earth at the same rate, creating a continuous state of weightlessness inside the spacecraft. Gravity is still present, just countered by their orbital motion.

Q: Is the 24 hour missing person rule true?

The rule is a Hollywood fabrication and not a real guideline. Police typically take missing person reports immediately, especially in cases involving children or potential danger. The early hours are critical for recovery, so delaying reporting can reduce the chance of finding the person.

Q: Which mountain is truly the tallest depending on how you measure?

Mount Everest is tallest from sea level to summit, but Chimborazo is farthest from Earth's center due to equatorial bulge, and Mauna Kea is tallest from base to summit with much of it submerged. The definition of tallest depends on the chosen measurement method.

Q: Is space truly silent, or are there sounds we can hear?

Space is not completely silent. It contains low density gas where sound can travel, and NASA has recorded faint signals in space such as a deep note from a galaxy cluster. These sounds are extremely low frequency and require specialized instruments to detect.

Summary & Key Takeaways

• Glass is not a slow moving liquid and the bottom thickness of old windows is due to practical construction, not flow, debunking a long standing belief. Water conducts electricity not in pure form but because impurities carry ions, making dirty water dangerous. The penny drop myth is broken by air resistance and terminal velocity, showing a non lethal outcome in practice.

• Hair and nails do not grow after death; what changes is the skin drying and retracting, exposing more nail or hair. Space has gravity and orbits explain weightlessness in terms of free fall, not absence of gravity. The 24 hour missing person rule is a Hollywood fiction with critical real world implications, urging immediate reporting.

• Mount Everest is not the only tallest when measured differently; Chimborazo and Mauna Kea exceed Everest under other metrics, illustrating measurement dependence. Space is not completely silent; there are detectable sounds in space via low frequency waves. Meteorites are often cold on impact because surface heat is shed before reaching ground.