----Discover interesting facts about the human body!----

　　**It takes food seven seconds to go from the mouth to the stomach.

　　**The width of your armspan* stretched out* is the length of your whole body.

　　**A sneeze* travels at over 100 miles (160 km) per hour.

　　**The farthest you can see with the naked eye is 2.4 million light years* (140,000,000,000,000,000,000 miles) away!  That's the distance to the giant Andromeda*. You can see it easily as a dim*, large gray "cloud" almost directly overhead in a clear night sky.

　　**Your brain is more active and thinks more at night than during the day.

　　**By the time we reach our teenage years, we've heard the greatest range* of sound we will ever hear for the rest of our lives.

　　**The sperm* is actually the tinest cell in human body, while the egg* is the largest. Five hundred million sperms are released in a single ejaculation*. Only a few hundred will make it as far as the Faliopian tubes* and just a few dozen will complete their journey.

　　**Your tongue has 3,000 taste buds*.

　　**The human body produces a half-pint (0.23 liter) of sweat in the course of a single day. In that same time, the body will create a pint of bile* and almost two pints of saliva* to help pass food through the body.

　　**The human brain is by far the largest user of energy in the body. It consumes one-fifth of the energy produced by what we eat and drink. The brain works at quite an accelerated pace, too, firing electrical impulses at 25 miles per hour. Unfortunately, 10,000 of the brain's 1 trillion brain cells naturally die in the course of 24 hours.

　　(The end)

　　(SD-Agencies)

　　(Difficulty: senior)

　　armspan  n. 胳膊跨度

　　stretched out 伸展开

　　sneeze vi. 打喷嚏

　　light year 光年

　　Andromeda 仙女座

　　dim adj. 模糊的

　　taste buds 味觉芽体

　　range n. 范围

　　sperm n. 精子

　　egg n. 卵子

　　ejaculation n. 射精

　　Faliopian tube 输卵管

　　bile n. 胆汁

　　saliva n. 唾液