UK: British Prime Minister Boris Johnson hold press conference in Downing Street. Part Three.

The video discusses measures to save lives and reduce infection spread, emphasizing the importance of existing measures. It highlights school closures, except for children of key workers, and provides guidelines for outdoor activities, stressing the need for social distancing to protect vulnerable individuals.

What is emphasized about social distancing in the text?

What potential risk is mentioned for individuals who feel invulnerable?