NoExplanation734
NoExplanation734 t1_is7dxkb wrote
Reply to Scientists have proved goldfish do have good memories and are able to navigate their surroundings. A team from Oxford University trained nine fish to travel 70cm (2.3ft) and back, receiving a food reward at the end. The study disproves the long-held belief goldfish have little or no memory. by Tardigradelegs
Goldfish are quite trainable. At my old job, one of my coworkers taught one to swim through a hoop and push a little plastic ball into a little soccer goal.
NoExplanation734 t1_j13wkhu wrote
Reply to comment by Vivid-Air7029 in When this bridge in Fort Benton, Montana, USA was built 1888 it was required to have a swing span to allow steamboats to navigate. It was considered the furthest navigable point on Earth, more than 2,700 miles from the Gulf of Mexico. by triviafrenzy
Before the invention of trains, it was much, much cheaper to ship by water than over land. Think about how long it would take and how arduous it would be to travel 2,700 miles by horse and cart with no roads, versus how easy and relatively quick it would be to just float down a river. There's a reason basically every major human settlement before the invention of the train was accessible by water.