Asymptotic iceberg

Asymptotic iceberg

  There is a German professor who is invited to China every year to study groundwater problems everywhere. Last month, before he went to China again,…

Lao Zi’s Wisdom

Lao Zi’s Wisdom

Three treasures Lao Tzu said, I have three treasures. I hold them and treasure them. The first is kindness, the second is frugality, and the…