A poignant moment of a man expressing his emotions, struggling to hold back tears.

Explore the incredible defense system of the human body, from the different jobs and components of the immune system to its response to infections and how it keeps you safe.

习惯可以改变一个人，好的习惯让我们变得更好，坏的习惯让我们不由自主。如何养成好的习惯，改变自己？

Watch the 6 God in action as Drake delivers his signature smooth flow and introspective lyrics in this compilation of live rap performances.

Um esquilo é filmado no topo de uma sequoia, oferecendo uma vista impressionante da floresta ao redor.

记录了夕阳下田园风光的美丽景象，晚霞、金黄色的小草和摇曳的狗尾草，伴随着晚风，展现了一片宁静而美丽的乡村景色。

Russian President Vladimir Putin is seen dancing at a public event, showcasing a rare lighthearted moment.