The metric highway
Interstate 19 is a highway running from the Tucson, Arizona to the Mexican border. It is unique among American highways: the signs are in metric.
The origin of crops
In 1924 Nikolai Vavilov, a Russian / Soviet scientist, identified the geographic regions where crops were first domesticated: the Vavilov Centres of Diversity.
World computer
What are the practical limits of computation? Hans-Joachim Bremermann theorized a computer the size of the world, as old as the world. It could process 10^93 bits.
Space cemetery
Where do old spacecraft go to die? Into a graveyard orbit, or into the middle of the Pacific Ocean.
The death of the Atlantic
Continents move – we know this. The Atlantic is growing thanks to the expansion of the Mid-Atlantic Ridge. But in the future the ridge may start subducting. And with it, the Atlantic may become an inland sea.
Dead rabbit pregnancy test
In the 1930s there was a reliable and accurate way to find out if you were pregnant or not. But you had to kill a rabbit.
Speed-limit skirt
The hobble skirt was an unfortunate fashion trend in the early 20th century. Women’s skirts were tied very tight at the hem, preventing them from running or even walking fast – hence the nickname “speed-limit skirt.”
Bird milk
Mammals make milk – it’s one of their defining features. But certain birds (including pigeons, doves, and albatrosses) do as well.
That that is is that that is not is not is that it it is
“That that is is that that is not is not is that it it is” – add punctuation, and this sentence transforms from babble to sense. But, depending on which punctuation you add, it can make four different sentences.
The engineer’s ring
After years of toil and study, the Seven Wardens call you to attend a sacred ritual. At that ceremony, you swear a secret vow and are awarded a ring of iron. Classical cult? Medieval guild? Nope, you’re now a Canadian engineer.
