Denali: Facts About North America's Tallest Mountain dlvr.it/C253K9

Earth Lost Half Its Trees to Humans oak.ctx.ly/r/3nh4o

An Unexpected Side Effect Of Ibuprofen dne.ws/1JHE3wb

Day 163. Black as night as the #sun goes out with a shimmering light. #GoodNight from @space_station! #YearInSpace

My gift to you on #LaborDay, #USA. Enjoy! #YearInSpace amp.twimg.com/v/d445688c-ed6…

Day 165. On the number of stars in our #MilkyWay galaxy, mind blown. Good night from @space_station! #YearInSpace

Kayaking with sharks in French Polynesia | Photo by Matthew Nitschke

Day 166. #Venus photobombed the #Moon tonight. Good night from @space_station! #YearInSpace

Alien hunters, look no further than Saturn's moon Enceladus. on.natgeo.com/1W6genc

By morning's Northern lights. Good morning from International Space Station! #YearInSpace

Day 180. Moonlight over Italy. #BuonaNotte Good night from @space_station! #YearInSpace

A rant on #WhenIWasYourAge follows…

#WhenIWasYourAge Photographs were records of your life experience, and not the life experience itself.

#WhenIWasYourAge A photograph lived inside your camera, cloaked in mystery for weeks, until you took exactly 35 more photos.

#WhenIWasYourAge We had candy cigarettes, gun-shaped cigarette lighters, and sucked flavored sugar through a straw.

Top 10 subatomic surprises: ow.ly/T60Tx #neutrinos #NobelPrize

Day 200. Sometimes a little light makes all the difference. #GoodNight from International Space Station #YearInSpace

The 9 Biggest Unsolved Mysteries in Physics oak.ctx.ly/r/3uiz2

Could silicon be a platform for quantum computing? ow.ly/TmsW2

First Dogs as Pets May Have Come from Nepal, Mongolia: dne.ws/1OQ8u6s