首页
登录
职称英语
You can tell a lot about people by looking at their hair—and not just whethe
You can tell a lot about people by looking at their hair—and not just whethe
游客
2023-10-11
26
管理
问题
You can tell a lot about people by looking at their hair—and not just whether they brush, spray, or blow-dry.
Scientists have found a way to use hair to figure out where a person is from and where that person has been. The finding could help solve crimes, among other useful applications.
Water is central to the new technique. The liquid makes up more than half an adult human’s body weight. Our bodies break water down into its parts—hydrogen and oxygen.
But not all water is the same. Hydrogen and oxygen atoms can vary in how much they weigh. Different forms of a single element are called isotopes(核素). And depending on where you live, tap water contains unique proportions of the heavier and lighter isotopes of hydrogen and oxygen.
Might hair record all this information? That’s what scientists wondered. To find out, researchers collected hair from barbers in 65 cities in 18 states across the United States. The researchers assumed that the hair they collected came from people who lived in the area.
Even though people drink a lot of bottled water these days, the scientists found that hair did reflect the concentrations of hydrogen and oxygen isotopes in local tap water. That’s probably because people usually cook their food in the local water. What’s more, most of the other liquids we drink contain large amounts of water that also come from sources within their region.
Scientists already knew how the composition of water varies throughout the country. By combining that information with the results, they predicted the composition of hair in people from different regions.
The new technique can’t point to exactly where a person is from, because similar types of water appear in different regions that span(跨越)a broad area. But authorities can now use the information to analyze hair samples from criminals or crime victims and narrow their search for clues.
Based on the finding, one research offers this advice:"
If you’re a criminal, shave.
" [br] This new technique might help with______.
选项
A、tracking down lost animals
B、the prevention of water pollution
C、identifying criminals without hair
D、the identification of crime victims
答案
D
解析
倒数第二段末句指出有关当局可以利用这些信息分析罪犯或者受害者的头发样本,以缩小其搜索范围来准确寻找线索,由此可知此技术可以帮助辨认犯罪受害者。
转载请注明原文地址:https://tihaiku.com/zcyy/3089104.html
相关试题推荐
Sixtypeoplediedin84,crashessince2000一morethandoublethenumberofcrashe
Doyouthinkit’struethatpeople_____areagainstnuclearweapon?A、inparticu
Overtenpeoplediedandtwentypeoplewere_____woundedinthetraincrash.A、e
Importantpeopledon’toftenhavemuchfreetimebecausetheirwork____allthe
Tinypeoplemightbelivinginsideofyourcomputer—eating,sleeping,andgo
Tinypeoplemightbelivinginsideofyourcomputer—eating,sleeping,andgo
Tinypeoplemightbelivinginsideofyourcomputer—eating,sleeping,andgo
Whencompaniesdobusinessoverseas,theycomeincontactwithpeoplefromdiffe
InAmericanbusinessmeetings,peopleareexpectedtoparticipateverbally(
InAmericanbusinessmeetings,peopleareexpectedtoparticipateverbally(
随机试题
LaughterIstheKeytoHappinessIntroduction
ElizabethWillard,themotherofGeorgeWillard,wastallandgauntandher
Ifoursocietyeverneededareadingrenaissance(复兴),it’snow.TheNational
D由逻辑电路的基本关系变换可得结果,变换中用到了逻辑电路的摩根定理。
钢丝涂塑层厚度为0.25~0.38mm,钢丝直径越粗,其涂塑层越薄。()
关于痛风,下列说法中错误的是A.痛风关节炎的发作无自限性 B.确诊痛风的依据是
教师体罚学生,对学生身体造成严重伤害的,除要承担一定的行政责任外,还要承担()
2002-133.小儿夜啼,应考虑的原因是 A.惊恐为病B.心经有热C
假定某金融资产的名义收益率为5%,通货膨胀率为2%,则该金融资产的实际收益率为(
某工程施工承包单位将其承包工程中的劳务作业发包给某劳务分包单位,双方约定劳务报酬
最新回复
(
0
)