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Scoop That Poop
我好“無辜”的
Actually, dog poop turns out to have a pretty big environmental impact. If you think that two in five households in the U.S. have at least one dog and that about forty percent of Americans don't clean up after their pooches, well, all that poop really adds up. In fact, it's what scientists call the Fido hypothesis.
狗狗便便嚴重汙染環境。如果美國2/5家庭就養一隻狗狗且當中大約40%的主人不收拾狗狗的便便。所有這些便便加起來也就是科學家說的`“狗狗”假說。(Fido是對狗狗通用的稱呼)。
Hey, my dog's name is Fido.
我的狗狗就叫Fido。
They conjecture that a lot of that waste ends up in waterways. Recent studies, in fact, suggest that dogs are in third or fourth place on the list of contributors to bacteria in water. Talk about gross—fecal matter is full of disease-causing bacteria like E. Coli, salmonella, and giardia.
科學家推想，水道阻塞的罪魁禍首就是這些便便。近日有研究表明，造成水裡滋生細菌的“元凶”狗狗排第三或第四。令人作惡的這些細菌可以致癌，比如：大腸埃希菌、沙門氏菌、鞭毛蟲
Now that bacteria-tracking methods have gotten better, scientists estimate that in some areas, 20 to 30 percent of the bacteria in a stream comes from dogs.
細菌源追蹤技術的日臻完善，科學家估計，部分地區20%到30%的細菌是由狗狗造成的。
Really? That can't be good!
真的嗎?那可不妙!
And the thing is, pollution from dogs is relatively easy to control. All you have to do is scoop when they poop.
其實，狗狗造成的環境汙染相對來說很容易避免，你需要做的只是在將狗狗的便便鏟乾淨。
part 2隧道與廣播
How come we can hear FM longer in a tunnel than AM?
為什麼在隧道中調頻廣播比調幅廣播的訊號要好一點?
It's because FM stations transmit at higher frequencies. They generally go from eighty-eight to one-hundred-and-eight megahertz. That's over a hundred million cycles per second.
這是因為調頻廣播臺的傳播頻率要頻繁些。通常在88到108兆赫。即每秒轉1億圈。
As a result, a single radio wave from an FM station is only a few meters long, about the size of a car. An AM station is putting out radio waves that are hundreds of times as long!
因此，調頻廣播電臺發出的一個電波的長度只有幾米，大概是一輛車的大小。而調幅廣播站發出的電波長達幾百米。
Long wavelengths tend to be absorbed or blocked as they try to enter the smaller tunnel. The higher-energy and shorter-wavelength waves from an FM station aren't absorbed or blocked as much. Instead, they tend to bounce around and get reflected off of surfaces, much like the inside of a tunnel.
在穿越隧道時，長的波長會被吞併阻礙。而來自調頻廣播高能量，波長又短的電波則不會被吞併或阻礙。相反的，它們會被隧道表面反射回來。
Of course, they only bounce so far. If the tunnel is long enough, even FM stations fade out until you come out the other end.
當然，它們只會在某個區域內反彈。如果隧道太長的話，即使是調頻廣播也會逐漸變弱直到駛出隧道。
