Scientific American's Sixty

Theres nothing like a good steak. And our Australopithecus afarensis ancestors apparently felt the same way. Because new discoveries from Ethiopia show that what was likely the species of the famous fossil Lucy used stone tools to butcher meat from b

发表于:2019-01-08 / 阅读(214) / 评论(0) 分类 未知分类

Doctors like to think that theyll turn in colleagues who are doing a particularly bad job. But its not so straightforward when physicians are faced with such a colleague, according to a study published in the Journal of the American Medical Associati

发表于:2019-01-08 / 阅读(197) / 评论(0) 分类 未知分类

This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. 'Tis the season when many of us go on a seafood diet: we see food and we eat it. But if you want to avoid packing on the pounds, a new study suggests tha

发表于:2019-01-08 / 阅读(251) / 评论(0) 分类 未知分类

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Mosquitoes carry nasty diseasesdengue fever, west nile, malaria. But the microbes that cause those diseases dont attach themselves to the mosquitoes an

发表于:2019-01-08 / 阅读(268) / 评论(0) 分类 未知分类

This is Scientific American's 60-Second Science. I'm Steve Mirsky . Got a minute ? We residents of the Milky Way should have a little extra skip in our step today. Turns out our home galaxy is much bigger and moving a lot faster than we previously th

发表于:2019-01-08 / 阅读(251) / 评论(0) 分类 未知分类

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. If we want to learn more about our planet and other planets in the universe, we can get some help from stars that are long dead and gone. Thats what U.

发表于:2019-01-08 / 阅读(205) / 评论(0) 分类 未知分类

This is Scientific American's 60-Second Science. I'm Adam Hinterthuer. Got a minute? Man-made light sources can really throw animals for a loop. Moths can't tear themselves away from lightbulbs, and newly hatched sea turtles often shun moonlit ocean

发表于:2019-01-08 / 阅读(245) / 评论(0) 分类 未知分类

This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. Aspirin is a popular painkiller, and chances are you have some in your medicine chest right now. You might even have some in your flesh-and-blood, put-a-

发表于:2019-01-08 / 阅读(202) / 评论(0) 分类 未知分类

This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. Have you ever turned off your lights and heard [mosquito buzz]? To you its a sound that signals bites in the night. But to a male mosquito its a love son

发表于:2019-01-08 / 阅读(209) / 评论(0) 分类 未知分类

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Thousands of medieval European books survive to this day. Authors and scribes carefully handwrote the works on parchments made of animal skins. But the

发表于:2019-01-08 / 阅读(215) / 评论(0) 分类 未知分类

This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. A bird in flight is a thing of beauty. Even their takeoffs and landings usually look effortless. But pterodactyls? Well, thats another story. Scientists

发表于:2019-01-08 / 阅读(206) / 评论(0) 分类 未知分类

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. When we think about how to represent sound visually, most of us probably picture those volume-dependent sine waves. But thats not how John Stuart Reid

发表于:2019-01-08 / 阅读(250) / 评论(0) 分类 未知分类

This is Scientific American's 60-Second Science. I'm Adam Hinterthuer. Got a minute? Forget the scalpel, researchers at Johns Hopkins University have created a tool that can move easily through tissue, potentially making biopsies much less invasive.

发表于:2019-01-08 / 阅读(232) / 评论(0) 分类 未知分类

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Theres definitely methane on Marsand there are seasonal variations of how much is being released into the thin Martian atmosphere. Which means that Mar

发表于:2019-01-08 / 阅读(204) / 评论(0) 分类 未知分类

This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. A new study with worms shows that some have a gene that helps them stave off infections. Not through some kind of biochemistrybut by changing their behav

发表于:2019-01-08 / 阅读(218) / 评论(0) 分类 未知分类

This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. For years, scientists and physicians have been up in arms about the rise in antibiotic resistance. Seems that many bacteria, devious buggers that they ar

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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. If you have a dog, you know you gotta walk it. But do you know how it walks? Well, if you have no idea which foot Fido puts forward when, youre in good c

发表于:2019-01-08 / 阅读(228) / 评论(0) 分类 未知分类

This is Scientific American's 60-Second Science. I'm Adam Hinterthuer. Got a minute? Mosquitoes have an unwitting new ally in the war on infectious diseasesconservationists. Turns out that, for mosquitoes carrying dengue-fever, environmentally consci

发表于:2019-01-08 / 阅读(227) / 评论(0) 分类 未知分类

Transcript This is Scientific American's 60-Second Science. I'm Steve Mirsky . Got a minute ? Nearly 20 percent of servicemen and women returning from Iraq and Afghanistan report symptoms of post-traumatic stress or major depression. Another 19 perce

发表于:2019-01-08 / 阅读(254) / 评论(0) 分类 未知分类

This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. Its good to be the Queen. You get fed and cared for and generally treated like royalty. But if youre a blue butterfly caterpillar, you can get the same b

发表于:2019-01-08 / 阅读(213) / 评论(0) 分类 未知分类
学英语单词
advice sheet
al khaburah (khabura)
amabelle
andresson
apparent earth conductivity
aspergilus flavus
azaleamum
Beggars can not be choosers
bevalaqua
bilenge
bit-serial common carrier
blow off cock
brazen it through
bring one's hogs to a bad market
brow antler
buildingwide
by-tale
chondriomere (meves 1918)
Coast Guard
cobalt unit
common-law cheat
complementary symmetry emitter follower
confirmed negotiation letter of credit
coriolis theorem
cremest
cryptomer
dialyzability
dictionary entries
Dictionary of National Biography
dilaurate
disc(disk)
drive someone to despair
drygalski ice tongue
Elatostema hekouense
epigynous stamen
fatigue crack initiation
galbart
hairnetted
Herbasse
herbrough
holy men
horn process
hydrogen oxygen fuel cell
inductotherm apparatus
internal diameter of delivery hose
jackrod
jacques loebs
joint estimation
Kaliyuga
leading circle concept
master reference machine
metering digit
milphosis
mitment
Moore L.
multiplicative object
multiprogramming interrupt
nitrosonaphthol
nominal thickness
nondated
Nyssa shweliensis
olefinic oxygenation
omnimane
opposite forces
optical direction ranging
out tuning
outrigger wheel
paracoccidioidal
peacockery
phototelegraphic
post-fix
protobios
recurrent backcross
recursive contour coding
retained of trade
root canal irrigation
run a plant
schwartzmann phenomenon
securities deposited from others
semiautomatic working
serpentinic
shouldermark
sireny
spellbinder
spheric pyranometer
SR (shift reverse)
statistical identifiability
striate body
successor
sulfurylfluoride
sulphur butterfly
tensile test piece
test of hypothesis
Three Class of Reserves
tinosporine
tr.
tree-ring analysis
triple valve
trophogenic layer
UHF carrier
unconvertible security