In 1959, geologist Paul T. Walker left a bottled message in a cairn on Ward Hunt Island in the Arctic (83’N latitude), allowing its finders in 2013 to determine that a nearby glacier had retreated over 200 feet in 54 years. It is the only known time capsule in the Arctic region. Paul T. Walker didn’t know then whether the glacier was advancing or retreating. Still, he wanted a reference point that would allow future researchers in the area to provide him with important data. Sadly, the same year, he had a stroke in the field and died.