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About atoms in chemistry?
Wich used lcd 24 inch/66cm it s better Samsung-Panasonic Vieira-Toshiba Regza ?
I am aware of the international online media about the covid-19 circus, and there is a new expression called hespress, I would like to find out what does that mean exactly. All this coronavirus misery upsets me 'cause before the worldwide pandamic I could find interesting and informative articles about international economy, banking, politics etc. Now all you can read about is covid and how many have died, how many have been in hospitals. It is sad that all the news sites and media providers only - or mainly - talk about the virus and it's aftermath. Life isn't just about drama and sickness, please! Wow.. so please tell me somebody what's there to know about this so called hespress. Thank you
We already know where did this pandemic originate from: China. But do we already know who was the first person infected and when did this person contact the virus? Were scientists able to determine this?
Like absentmindedly drumming on a tabletop, idly running a finger around the rim of a glass can make a kind of music—an otherworldly, ghostly music. How come?
Even if your family groans when you sing along to the car radio, even if you didn’t make the cut for the choir, and even if you got asked to be the drummer rather than the lead vocalist in your friends’ garage band, you sound exactly like your favorite pop (or opera) star in the shower. How come? And why do we enjoy singing in the shower to begin with?
There’s an official name for the horrible sounds that emanate from a blackboard: chalk squeal. Scientists say that the explanation involves both friction and resonance.
When you hold a large seashell to your ear, you can hear a distant roaring sound. It’s as if the great rumble and crash of the ocean waves is somehow trapped within the shell. So when you bring a seashell home from the beach, it keeps the memory of the sea alive. But even if you don’t have a seashell handy, and it’s too cold to go to the beach, you can always hear the ocean. Just pick up an empty coffee mug, and hold it to your ear, tilted slightly away. Ah, there it is—the gentle, echoing roar of the waves.
Have you ever stood on a city sidewalk and heard the distant wail of an approaching fire engine? As the fire truck comes into view, the sound of its siren becomes louder and more frantic, the wail higher and higher pitched. Then, as it passes, the opposite effect occurs: The sound of the siren drops in pitch, getting lower and lower as the vehicle vanishes into distant traffic. But the fire truck’s driver hears no such change; to him, the siren that he flipped on 20 blocks ago has sounded at a steady pitch.
We’ve all seen it in movies or old TV westerns—as the stagecoach (or train) picks up speed, its fast-moving wheels appear to switch direction, slowly turning backward. We also occasionally see the phenomenon in real life, with spinning car tires and whirling ceiling fans. Scientists call it the Wagon-Wheel Effect. What causes the “backward” effect?
In Lewis Carroll’s Through the Looking Glass , Alice (of Alice’s Adventures in Wonderland fame) discovered that a mirror was a doorway to a parallel universe, where everything is reversed—and anything might happen. While mirrors aren’t really an entry to another world, they are very curious objects. A mirror seems to reverse left and right—making newspaper headlines and T-shirt slogans read backward, and flipping the image of your face and body. But a mirror doesn’t flip top and bottom—we don’t appear in a full-length mirror with our head at the bottom, feet and floor at the top.
Ah, summertime. Season of cookouts, fireworks, road trips, and mirages . . . like that cool, shimmering pool of water on the highway ahead on a scorching-hot, drought-dry day. Mirages can be even more spectacular in Earth’s coldest regions. Take a trip to the Arctic, and if conditions are just right, you may see an upside-down iceberg, seemingly hanging in the air above the sea.
What do a clear (clean) soap bubble and a dark (dirty) oil spill have in common?
Remember Superman’s X-ray vision? His eyes shot X-rays at a door; the beams bored through, and he could see what his enemies were up to on the other side. Only doors made of lead could foil Superman. Lead is a good shield against X-rays. That’s why we wear heavy lead aprons at the dentist’s office. But Superman’s X-ray eyes came from the imagination of his creator. Eyes can’t shoot beams of light. Our eyes see when light from other sources, like the Sun, is reflected back from an object. However, X-rays are indeed a kind of light—a kind that is invisible to us. X-ray light has a lot more energy than visible light. That’s how it can penetrate wooden doors—or skin and muscle.