Is the kilogram defined by a physical object?
Since 2019, the kilogram has been defined by fundamental physical constants, not a metal prototype.… Is the kilogram defined by a physical object?
Can a person survive without a functioning brainstem?
The brainstem controls vital functions like breathing and heart rate, making survival impossible without it.… Can a person survive without a functioning brainstem?
Is the Great Wall of China visible from the Moon with the naked eye?
This is a myth; astronauts confirm that the Wall is not visible from the Moon… Is the Great Wall of China visible from the Moon with the naked eye?
Is DNA the molecule that carries genetic information in most living organisms?
DNA (deoxyribonucleic acid) contains genetic instructions for growth, reproduction, and function in almost all known… Is DNA the molecule that carries genetic information in most living organisms?
Has a human ever set foot on Mars?
While robotic missions have explored Mars, no human has physically landed there yet. Over the… Has a human ever set foot on Mars?
Is gold an element on the periodic table?
Gold (Au) is a naturally occurring element with atomic number 79, known for its unique… Is gold an element on the periodic table?
Can sound travel through a vacuum?
Sound requires a medium (air, water, or solid) to propagate. In a vacuum, there are… Can sound travel through a vacuum?
Does the human body contain more bacterial cells than human cells?
The human microbiome consists of trillions of bacteria, outnumbering human cells by about 10:1, though… Does the human body contain more bacterial cells than human cells?
Is Antarctica the coldest continent on Earth?
Antarctica holds the record for the coldest temperature recorded on Earth (-128.6°F/-89.2°C). This extreme cold… Is Antarctica the coldest continent on Earth?
Do all mammals have a backbone?
Mammals are vertebrates, meaning they all have a spinal column, a defining trait of their… Do all mammals have a backbone?
Is the speed of light faster than the speed of sound?
Light travels at approximately 299,792 km/s, while sound moves at about 343 m/s in air,… Is the speed of light faster than the speed of sound?
Is water composed of hydrogen and oxygen?
Water (H₂O) is one of the most important substances on Earth. Every living thing—people, animals,… Is water composed of hydrogen and oxygen?