yaw string
...that the yaw string, a simple tuft of yarn used as a flight instrument by the Wright brothers, is still in use today?
...that the <b id="mwAQM"><a href="./Yaw_string" id="mwAQQ" rel="mw:WikiLink" title="Yaw string">yaw string</a></b>, a simple <a class="mw-disambig" href="./Tuft" id="mwAQU" rel="mw:WikiLink" title="Tuft">tuft</a> of <a href="./Yarn" id="mwAQY" rel="mw:WikiLink" title="Yarn">yarn</a> used as a <a href="./Flight_instruments" id="mwAQc" rel="mw:WikiLink" title="Flight instruments">flight instrument</a> by the <a href="./Wright_brothers" id="mwAQg" rel="mw:WikiLink" title="Wright brothers">Wright brothers</a>, is still in use today?