Is it better to put food in the refrigerator when it is cold, or to put it in the refrigerator while it is hot? Here is the answer Blog
The Webb Space Telescope, which cost tens of billions of dollars and took 25 years to build, has finally been launched! How is it different from the Hubble? Blog
In the wars of unification of ancient Chinese dynasties, why was Zhu Yuanzhang the only one who could unify China from south to north? Blog
