Russian balloon more than halfway to circumnavigating globe - The Columbian
Turkish combat drone passes 20,000-feet altitude test
Analog altimeter - MD215 - Mid-Continent Instruments & Avionics, Inc. - feet or meters / 2-inch / for aircraft
What is the temperature outside of an airliner at cruising altitude? - Quora
20000 feet in meters - Calculatio
Weather
Omega's Newest Dive Watch Can Take You 20,000 Feet Under the Sea
TIL that mountain climbing is banned in Bhutan. Originally the ban was only with respect to mountains over 20,000 feet (6,000 meters) but in 2003 the ban was expanded to all mountaineering. : r/todayilearned
20000 Feet 6096 Meters by sGTSkrym on DeviantArt
Above the Clouds: Photos from 20,000 feet (6000m) » TwistedSifter