The first humans emerged in Africaaround two million years ago, long before the modern humans known as Homo sapiens appeared on the same continent. There's a lot anthropologists still don't know about how different groups of humans interacted and mated with each other over this long stretch of...
As for the question of whether people actually want to be so close to bugs, snakes and nesting birds, the designers acknowledge that modern humans have been trained to stay away from such creatures. But Hougaard says these structures keep animals contained, while allowing people to observe and ...
Modern humans evolved about 160,000 years ago, but for 95 percent of that time our ancestors lived exclusively in small groups of nomadic hunter-gatherers. Only the warmer and climatically stable conditions that began about 10,000 years ago permitted agriculture, permanent settlements, and complex...
When did the first modern amphibians arise? When did the first amphibians move to land? When did vertebrates, amphibians, reptiles and mammals first appear? When did reptiles, amphibians, mammals and humans first appear? When do amphibians develop gills? When do amphibians eggs hatch? Did reptile...
"We can be confident of this because there have been two massive explosions while humans were present on Earth, and both of these were actually larger than Yellowstone's most recent cataclysmic eruption," the Geologic Survey said. "These eruptions were from Toba, Indonesia, about 74,000 years...
onalltypesofroads.However,mostofthedata onself-drivingcars?safetyhavebeenrecordedofteningoodweatherandonhighways,wherethe mostimportanttasksarestayinginthecar?sown laneand not getting too closeto the vehicle ahead.Automatedcarsaregoodatthosetasks, butsoarehumans. Itistruethatself-driving cars don?t get...
the universe.When did humans first go into space?The story began not so long ago,(4) Cthe first astronauts were not people一they were animals. Scientists wanted to make traveling to space as(5) Aas possible for humans.So they decided to experiment(试验) with animals ...
But it was the little things she gave me that let me feel really warm, like letting me put my fingers in the sugar bowl, letting me drink the coffee from her cup or allowing me to sit on the table as I had meals.Though she didn’t have much, she did something for my brother ...
Last summer I did my best to___it by feeding it a lot of fertilizer(肥料)but___.This morning I went out and looked at it again. I was___on whether it would be better to just cut it down. It would make mowing the lawn___and I would no longer have to watch it die. As...
“Humans have been practicing agriculture for 12,000 years,” Schultz said. “Ants, for 66 million years.” The ants employ helpful bacteria to keep their fungal crops healthy from disease and appear to have more success than human farmers often do with their crops. ...