Humans have always peed and pooped, but where it goes after we’ve done our business has changed a lot. In fact: The water you just drank may well have been a part of someone’s urine just weeks ago! SciShow explains!

Since January 2012, SciShow has been uploading hard science and good times to viewers just like you around the world. Now, after nearly two years -- and a million subscribers(!) -- we think it's time to take our relationship to a whole...

What has eight arms, three hearts, and and lives in the ocean? An octopus! Join Jessi and Squeaks as they take a dive into the amazing world of the super weird, super smart octopus!

Howcast - Freezing rain can wreak havoc for days. Make sure your loved ones are protected.

Howcast - Is a constantly running toilet driving you mad? Don’t call the plumber until you try these simple adjustments.

Howcast - If your toilet wobbles, has a leak, or if you smell sewer gas in your bathroom, you may have a broken flange.

Howcast - Learn how to care for a leopard gecko from the animal experts at traveling petting zoo Squeals on Wheels in this Howcast video.

Howcast - Learn how to connect and disconnect the air tank on a paintball gun from paintball pro Mike "Pev" Peverill in this Howcast video.

Howcast - Learn the difference between compressed air and CO2 or carbon dioxide from paintball pro Mike "Pev" Peverill in this Howcast video.

Howcast - Check out part 18 of this walkthrough for the first person shooter, Battlefield 3, made by DICE, and find out how to beat "Thunder Run".

Howcast - Learn how to beat Swifty's Crane in this walkthrough for 2k Games' new release, The Darkness 2.

Howcast - Head for the Shibuya Underground Mall in Binary Domain, the squad-based third-person shooter from Yakuza Studio.

Howcast - To get or renew your vehicle registration, and cut down on pollution, you may need to pass an emissions or smog check test.

Howcast - Learn how to set up a snake aquarium in this Howcast video about pet snakes.

Howcast - Particles and sediment can build up inside of your hot water tank, making it less efficient and shortening its life. But if you drain the tank periodically, you can wash the sediment away.

Howcast - Learn how to set up a saltwater fish tank with the help of aquarium expert Joseph Caparatta in this Howcast video.

Howcast - Learn how to keep big fish tanks in the house from aquarium expert Joseph Caparatta in this Howcast video.

Howcast - Learn how to set up a fish tank maintenance chart from aquarium expert Joseph Caparatta in this Howcast video.

Howcast - Learn why a fish tank can still smell bad even after you clean it from aquarium expert Joseph Caparatta in this Howcast video.

Howcast - Learn how to clean fish tank sand from aquarium expert Joseph Caparatta in this Howcast video.

Howcast - Learn five tips for how to take care of a tokay gecko from reptile and amphibian expert Jungle Bob in this Howcast video.

Howcast - Learn seven tips for how to take care of a leopard gecko from reptile and amphibian expert Jungle Bob in this Howcast video.

Howcast - Learn six tips for how to take care of a green or brown anole from reptile and amphibian expert Jungle Bob in this Howcast video.

Howcast - Learn about the most common plumbing tools needed for home repair from Master Plumber John Wood in this Howcast video.