When this epochal achievement possibly occurred; Reference to the book 'Homo erectus'; Importance of the mastery of fire to human development.EBSCO_AspJournal of College Science Teaching
Fire was discovered many thousands of years ago.The first time humans saw fire was probably when a tree was destroyed by lighting(闪电).Humans soon learned how to make fire.They probably made the first fire by rubbing(摩擦)two sticks together.Fire was very important to humans.They needed to...
When shall we get started? I was told not to work too hard. He slowed or makes mistakes in spelling. Don't make such a loud noise. Try not to eat too much at the party. It was his first day working here. They will help me find a good job. I don't think my husband would le...
At first I felt my potatoes had no taste at all. But after a while I started to prefer healthier food because I felt stronger and I didn′t get sick so often.So we agree that you become what you eat. Do you know what your friends eat just by looking at them When you know the ...
The Red Flag Canal was started to build in the 1960s. The whole project took ten 61 to complete. It was really hard work. People used 62 tools to dig the canal,completely by hand. Now it has 63 helped the local people by bringing water to them and serves as the lifeline for the ...
Fire was discovered many thousands of years ago. The first time humans saw fire was probably when a tree was destroyed by lightning(闪电). Humans soon learned how to make fire. They probably made the first fire by rubbing (摩擦)two sticks together. ...
Now a new study expands on the effect of this so-called incubation by using sound cues to focus the sleeping mind on a targeted problem.When humans sleep, parts of the brain replay certain memories, strengthening and transforming them. About a decade ago researchers developed a technique, ...
onmethatnootherplacehas,”Ginnisays.“IrememberthefirsttimeIsawahumpbackwhale;it justroseoutofthewaterlikesomeprehistoric creatureandIthoughtitwassmilingatus.You couldstillheartheoperaticsoundsitwasmaking underwater.” Therealizationthatthisisapreciousland,to berespectedbyhumans,wasoneofthebiggest thingsthathi...
When people started using plastic (塑料) in the 1950s, they found it such a wonderful thing. It helps keep food better and longer, make machines lighter and protect against illness. But we find something bad after over-using it. Plastic is hard to break down. Poisonous (有毒的) things ...
Fire was discovered many thousands of years ago. The first time humans saw fire was probably when a tree was destroyed by lightning (闪电). Humans soon learned how to make fire. They probably made the first fire by rubbing (摩擦) two sticks together. Fire was very important to humans. Th...