B It's known that most animals have tails(尾巴). But why don't humans have them?Well, millions of years ago, humans did have tails, but we slowly lost them. However, a team has built a robotic(机器人的) tail for old people to help them keep their balance (平衡)The tail is one...
So how did this happen? Our mammal friend the whale gives us the perfect example of an atavism, a trait from a distant evolutionary ancestor that has reappeared in a modern-day organism. Millions and millions of years ago, the ancestors of whales walked on land. Over time, they went from...
根据倒数第二段中For one thing, at some point we developed a unique ability to control our body temperature while running, which might have helped people catch prey (猎物) in hot and dry conditions.可知,根据Daniel Lieberman的说法,控制体温有助于在炎热干燥的条件下捕获猎物。故选B。4. 细节理解...
Have you ever noticed that most animals have tails of one kind or another? Humans no longer have tails, although we have a tail bone, so we had a tail at some point in our evolution. Since we don't have tails we tend to think they're not very important, but animals actually use t...
“Where have I come from, where did you pick me up? ” the baby asked its mother. She answered half crying, half laughing, and clasping the baby to her breast, — “You were hidden in my heart as its desire, my darling. “You were in the dolls of my childhood's games; and whe...
Here you are, you and your group, you did everything in your power to increase the odds of a certain event E occurring. And finally it's there: The Decision. Dice are rolled, and Dice Say No. Game over. Oh. Now we play the exact same game, end up in exactly the same position....
but she made it look effortless. If we complainedabout not having what another kid did, we'd hear something like, "I don't care what so-and-sogot for his birthday, and you are not getting a TV in your room, a car for your birthday or a sweet party." We had to earn our allowa...
Why did the first Homo sapiens make art? How proprioception is used in dancing? Why do dogs have tails? Why can't humans synthesize vitamins? How does visual pollution affect humans? How does the eye work? Why do deaf dogs bark?
And of course, thanks to you for listening to our show and making this all possible. Please share this episode with a friend if you think they would enjoy it. The number one way that we get to new listeners is by word of mouth, and if you're listening on Apple, please leave ...
varying labor market conditions across skill types, did not exist in the late 1970s but today is ubiquitous. 4. Model The goal of this section is to build a tractable model of the labor market capturing the conditions workers face when choosing an employment status and occupation. For ...