If I glance at your passport, I am able to figure out — depending on where you are from — your age, your country of origin, your full name, your social security number, and your gender, among other things, and in order to retrieve these bits of information from your passport, I need first and foremost to be able […]
Tag: Electromagnetic Radiation
Gravity is one of the four fundamental interactions in nature — the three others being electromagnetism, the strong nuclear interactions, and the weak nuclear interactions — and it pervades space like an invisible field until infinity. Albert Einstein taught us that the gravitational field is spacetime itself, and that gravity is experienced as a result of large masses bending […]