double bubble
... that the shape that encloses two given volumes and has the minimum possible surface area is the double bubble commonly formed by soap bubbles?
... that the shape that encloses two given <a href="./Volume" id="mwDNk" rel="mw:WikiLink" title="Volume">volumes</a> and has the minimum possible <a href="./Surface_area" id="mwDNo" rel="mw:WikiLink" title="Surface area">surface area</a> is the <b id="mwDNs"><a class="mw-redirect" href="./Double_bubble_conjecture" id="mwDNw" rel="mw:WikiLink" title="Double bubble conjecture">double bubble</a></b> commonly formed by <a href="./Soap_bubble" id="mwDN0" rel="mw:WikiLink" title="Soap bubble">soap bubbles</a>?