shark migration patterns are changing. Now, in case you didn't know, sharks don't just pick one

corner of the ocean and then stay there. We might better describe sharks as nomadic, as they

love to stay in one area for a while

before moving on to someplace else. That move can be driven by any number of biological impulses,

too. For some, they travel farther in order to mate, while others do so to give birth. Even when

it's chasing a meal, sharks might follow that food to the ends of the earth.

But the most common reason behind these annual trips is really quite simple.

They are cold-blooded, which means that once the weather gets chilly, they become heat-seeking road-trippers.

But now the oceans are getting warmer.

That means that sharks are leaving their favorite summer homes much deeper into the season,

and arriving in their winter hunting grounds later as well.

It also means that they end up swimming in unfamiliar waters,

where things can go very, very wrong.

And just like sharks, we humans are also nomadic creatures.

Sure, some of us might build houses and put down roots, but not always.

In fact, for most of human history, people constantly traveled to what they hoped were

greener pastures, more resources, better weather, safer or more tolerant, you name it.

But as we've learned, moving to a new place

also comes with risk. It brings a new set of challenges that need to be overcome. It might replace

one set of fears with another or force us to rethink everything we once believed. And if you

believe the legends,

it has left some people feeling completely out of their depth.

...