Oxygen is the most abundant element in Earth’s crust and the third-most-common element in the entire universe. It sustains life as we know it on this planet, making it possible to take a breath, light ...

To understand nuclear decay equations. How to measure the activity of radioactive sources. Spontaneously means that the process of radioactive decay can not be speeded up or slowed down by physical ...

Why did they form at that time? Astronomers know from observing distant exploding stars that the size of the universe has ...

Part of Physics (Single Science) Unit 1: Atomic and nuclear physics Protons and neutrons are the heaviest particles in an atom and as a result they make up most of its mass. The mass of electrons is ...

MIT physicists developed a way to probe inside an atom’s nucleus, using the atom’s own electrons as “messengers” within a ...

David Chalmers’s formulation of the hard problem of consciousness owes a large debt to Thomas Nagel’s earlier paper, "What is it like to be a bat?" There, Nagel pointed out that “An organism has ...