True or False: Science

Explication : TRUE! This is the Mpemba effect. Under certain conditions, hot water freezes faster than cold water. This counterintuitive phenomenon is still being studied by scientists.

Explication : FALSE! The Sun is not on fire. It is an enormous ball of gas where nuclear fusion reactions occur. Fire requires oxygen, which is absent in space.

Explication : TRUE! Neutron stars are incredibly dense. Matter is so compressed there that a small amount would weigh billions of tons on Earth.

Explication : TRUE! Space is a near-perfect vacuum. Without molecules to transmit vibrations, sound cannot travel. In space, no one can hear you scream!

Explication : FALSE! This is a simplified but incorrect representation. In quantum mechanics, electrons exist in "probability clouds" around the nucleus, not in defined orbits.

Explication : TRUE! An average cumulus cloud contains about 500,000 kg of water. Large storm clouds can contain millions of tons of water suspended as droplets.

Explication : FALSE! Diamonds are very hard but not indestructible. They can be burned at high temperatures (about 850°C) and fractured by a violent impact. Hardness does not equal resistance!

Explication : TRUE! The Sun is about 150 million km from Earth. Light travels at 300,000 km/s, so it takes about 8 minutes and 20 seconds to reach us.

Explication : FALSE! Nitrogen makes up about 78% of Earth's atmosphere. Oxygen only makes up 21%. The rest is composed of argon, CO2 and other gases.

Explication : TRUE! The human body contains about 3 to 4 grams of iron, mainly in the hemoglobin of blood. This is enough to make a 7-8 cm nail.

Explication : FALSE! Plants breathe 24/7. Photosynthesis (which produces oxygen) only happens during the day, but cellular respiration (which consumes oxygen) is continuous.

Explication : TRUE! Genetically, all humans share 99.9% of their DNA. The remaining 0.1% explains all our physical differences and certain predispositions.

Explication : FALSE! A black hole is not a "hole" but an extremely dense celestial object whose gravity is so strong that nothing, not even light, can escape from it.

Explication : TRUE! At the core of the Sun, the temperature reaches about 15 million degrees. This extreme heat enables the nuclear fusion of hydrogen into helium.

Explication : TRUE! Koalas have fingerprints so similar to ours that they could theoretically contaminate a crime scene. Even experts have difficulty telling them apart!

Explication : FALSE! Pure (distilled) water is a very poor conductor. It is the dissolved minerals and impurities in water that make it conductive. Tap water conducts electricity, pure water does not.

Explication : TRUE! Scientists believe that atmospheric methane on these planets transforms into carbon under high pressure, creating "diamond rain" that falls toward the planet's core.

Explication : FALSE! Atoms are made up of even smaller particles: protons, neutrons and electrons. And protons and neutrons are themselves made up of quarks!

Explication : TRUE! The human body is an incredible factory. Every second, millions of cells die and are replaced by new ones, ensuring the constant renewal of our tissues.

Explication : FALSE! Gravity is actually the weakest of the four fundamental forces! The strong nuclear force is about 10^38 times more powerful. But gravity acts over large distances.