Song: Hello Vietnam; Singger: Pham Quynh Anh

English before sleeping - Make you more memorising - intelligent

------------- The Stronger, The Lighter The More Intelligent, The More Humble ------------- Càng Mạnh Mẽ Càng Nhẹ Nhàng Càng Thông Minh Càng Khiêm Tốn.

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2014/03/02

How Vaccines Work

Liz Waid and Mike Procter look at what vaccines are, and how they work in the body. Vaccines are used all over the world to prevent disease.

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