When you view a projected slide show or a movie, where is the picture? Is it on the film, in the air, on the screen, or in the eye of the viewer? This Snack will help you investigate and locate this type of image.
Iron filings will line up parallel to a magnetic field, making the pattern of the field visible. This is a simple Snack to build—and because the filings are trapped in a bottle, they don’t make a mess.
Have you ever wondered how an old-style doorbell works? This Snack shows you how. A coil of wire with current flowing through it forms an electromagnet that acts very much like a bar magnet. The coil will magnetize an iron nail and attract it in a remarkably vigorous way.
The rainstick is a traditional instrument thought to have originated in Chile, where cactus spines are inserted into dried, hollowed-out cactus branches that are then filled with pebbles, raw rice, or dried beans.
Arroja cien monedas. Retira todas las que queden en “cruz” y arma una columna con ellas; repite… De esta manera, tú has generado tu propio modelo práctico para representar el fenómeno de la desintegración radiactiva.
An LED connected in place of a headphone will flicker at the same frequencies that the headphone would have vibrated. If the light hits a solar panel connected to a speaker, it can reconstruct the sound.
You’ve probably seen an ice skater spinning on the tip of one skate suddenly start to spin dramatically faster. This speeded-up rotation results from a sudden redistribution of mass. You can make yourself suddenly spin faster while sitting in a rotating chair.