The <a href="https://en.wikipedia.org/wiki/Mount_Tambora" id="mwZA" rel="mw:WikiLink" title="Mount Tambora">Mount Tambora</a> volcano begins a three-month-long eruption, lasting until <a href="https://en.wikipedia.org/wiki/July_15" id="mwZQ" rel="mw:WikiLink" title="July 15">July 15</a>. The eruption ultimately kills 71,000 people and <a href="https://en.wikipedia.org/wiki/Year_Without_a_Summer" id="mwZg" rel="mw:WikiLink" title="Year Without a Summer">affects Earth's climate</a> for the next two years.