Just a quick one from Brady after his return from Nepal. Boiling video: www.youtube.com/watch?v=JTL4dj3Gx1o More about the mystery couple: bit.ly/16XCs3G Nepal Flag: bit.ly/10G3Ef3 Everest 8848: bit.ly/11ilGvs More clips from Brady's trip: bit.ly/12di1M8 Website: www.numberphile.com/ Numberphile on Facebook: www.facebook.com/numberphile Numberphile tweets: twitter.com/numberphile Google Plus: bit.ly/numberGplus Tumblr: numberphile.tumblr.com Videos by Brady Haran