Human beings are diurnal creatures. That means we are normally active during daylight hours, when our senses function most effectively. At night, humans do rather poorly: we cant see objects well, our color vision is entirely lost, and we dont have t...
Picture an elk walking through the forest, looking for some berries to nibble. Then, suddenly, a pack of wolves leaps from the bushes, surrounding the startled animal. The wolves close in. The elk looks for an escape route, but the predators tighten...
So because of its high sugar concentration, pure honey will never ferment or go bad. It may crystallize but by soaking the jar in hot water you can turn it back into a liquid. Adding water, however, lowers the concentration of sugar in the honey and...
Leave it on the shelf too long and honey begins to crystallize. Heating the honey returns it to its original condition, but if you add water, you could ruin the honey completely. Thats because honey, which is a preservative in its original state, fer...
Announcer: Day ten. Frankie and Rose are at the zoo. Frankie: Im going to tell you quietly while Rose has gone to buy an ice cream. Were in the middle of our third date! I guess you can say were dating now I think she really loves coming here to see...
In the eyes of vertebrates, such as mammals, birds, and reptiles, the path that the nerves take from the photoreceptors to the brain begins at the surface of the retina in front of the photoreceptors. Those nerves then come together to form the optic...
Worm grunting is the practice of driving a wooden stake into the ground and vibrating it with a flat piece of iron. The vibrations run through the soil and cause nearby earthworms to burrow up to the surface, where they can easily be collected. In fa...
Generally speaking, the larger the circle you move in, the greater the centripetal force you experience. So, the farther you move away from the center of the merry-go-round, the more force the merry-go-round must exert on you to keep you moving in th...
M: Professor Huosheng Hu of the University of Essex has developed the fish-bot to be able to find leaks in oil pipelines and to detect mines. But it looks like a fish, and moves gracefully like a fish. Chiledren:Just beautiful. Theyre brilliant. They...
The earth is its own ultrasound machine. All scientists have to do is record when and where the waves occur. Scientists measuring layers of rock in an area of the Pacific floor called the Nankai Trough discovered why earthquakes trigger tsunamis from...
The difference between these two mistakes may seem unimportant to a lay person, but to a cognitive psychologist it is crucial for understanding how language development occurs. In order for us to construct meaningful language, we must learn how to su...
W:Are British people really less open about their salaries? M:Well, let's find out! I've invited some of our BBC Learning English colleagues up here to the studio today. And when they arrive let's just ask them how much they earn. And we'll see how t...
The second type of vaccine contains an attenuated virus. This virus is alive, but has been grown in the lab for several generations, so it isnt able to multiply very well in humans. With the attenuated virus multiplying very slowly, your body is able...
If you open your mouth wide in the mirror and look at the arch in the back of your throat, youll see small creases on either side. These creases extend back into two of the tonsils, making it easy for food or bacteria to enter and cause swelling and...
What Beer Does To Your Brain Most everyone knows that alcohol impairs mental and physiological functions, but what actually goes on at the cellular level when you drink a beer? Alcohol interferes with the normal function of your brain cells. Under no...
