编辑语 From the Editors

Why You're Always Tired - The REAL Reasons - Dr. Berg

Why You're Always Tired - The REAL Reasons - Dr. Berg

第二大脑 Brain-2

• 开关深色背景 Switch Background Color：PC: ctrl + shift + L。Mac: cmd + shift + L。 Phone: Settings - Theme。
• 用于扩展内容的可点击按钮可能在：标题、标题前的三角形、视频图像中或下的三角形. Possible clickable buttons for expansion of the content: the title, the triangle before title, in or below video image.