5:00 - What the world would be like if people had gills/wings

So, you (and every other person who ever lived) was born with both gills... and wings. How to maximize your potential here? READ ON, FLYING FISH!

A) You need a super-efficient circulatory system in order to fly with wings (and I assume you want to be able to fly in this scenario). That means you can't half-ass this by being amphibious - it's go gill or go home.

B) That means that you're only fully functional when you're in the water. But those big ol' wings on your back are going to slow you down, making you way less efficient in the water than those atavistic wingless throwbacks. So you're going to be in constant competition for food.

C) In order to fully function, you're going to have to survive long enough to fashion a SCOBA (Self-contained Overwater Breathing Apparatus). Once you've got that full-body, gill-bathing piece of equipment, you'll be able to soar... After you spend an hour above-water waiting for your wings to dry out. So you're going to have to spend a lot of time engineering a watertank for the SCOBA big enough to hold enough breathable water, but that won't weigh you down to much. Maybe recruit the people at the Waterjet Propulsion Laboratories to help.

D) Once you can fly, the world is your oyster, where once oysters were your world! Fly onto land, craft weapons, burn fossil fuels, raise the temperature of the ocean, and boil those dolphin-kissers back below the waves. That's what they get for making fun of you back in fish-person high school.