The launch of <a href="https://en.wikipedia.org/wiki/Gemini_4" id="mw4w" rel="mw:WikiLink" title="Gemini 4">Gemini 4</a>, the first multi-day space mission by a <a href="https://en.wikipedia.org/wiki/NASA" id="mw5A" rel="mw:WikiLink" title="NASA">NASA</a> crew. <a href="https://en.wikipedia.org/wiki/Ed_White_(astronaut)" id="mw5Q" rel="mw:WikiLink" title="Ed White (astronaut)">Ed White</a>, a crew member, performs the first American <a href="https://en.wikipedia.org/wiki/Extravehicular_activity" id="mw5g" rel="mw:WikiLink" title="Extravehicular activity">spacewalk</a>.