Why is the sky dark at night? You might think the answer is obvious - the sun isn't up! But the only reason the sky looks blue during the day is that sunlight scatters off of the atmosphere -...
Esto representa la tierra... ¡Vale! ...y esto representa... ¿qué crees? ¿La luna? Sí. Bueno, nuestro primer desafío es: ¿Cuanta distancia las separa? Aproximadamente. Aproximadamente... ¿más o menos...
You may have heard that Einstein's theory of special relativity imposes a cosmic speed limit: nothing can travel faster than the speed of light. Well, that's wrong. All that Einstein...
What do you desire? What makes you itch? What sort of a situation would you like? Let’s suppose, I do this often in vocational guidance of students, they come to me and say, well, we’re getting out...