Once upon a time, there was a little chameleon. He loved colours! One day, he saw a shop with many balloons. The balloons ...

2019年11月26日联合国教科文组织第四十届大会上正式宣布，3月14日为“国际数学日”。之所以选择这一天，是因为连接“天圆”和“地方”的圆周率近似为3.14。这个节日旨在鼓励、庆祝、支持和协助国际数学活动，以进一步发展数学。2025年3月14日是第 ...

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...