4x1 - Can Algae Fuel Our Cars?

February 22, 2021

As the search for alternative energy sources continues, scientists are looking to the microcosmos and wondering: Can we use algae oil to power our cars, our airplanes, and maybe even our spaceships?

4x2 - How Do Microorganisms Pee?

March 1, 2021

4x3 - Becoming Your Own Baby Through Conjugation

March 8, 2021

4x4 - Getting to Know Our Single-Celled Ancestors

March 15, 2021

4x5 - Your Screen Is Covered In Human Blood

March 22, 2021

4x6 - Heliozoa: Round, Sticky, and Covered in Spikes

March 29, 2021

4x7 - How Diatoms Build Their Beautiful Shells

April 5, 2021

4x8 - Leeuwenhoek: The First Master of Microscopes

April 12, 2021

4x9 - The Fantastic Feet of the Microcosmos

April 19, 2021

4x10 - The Chaotic Life of Seashore Ciliates

April 26, 2021

4x11 - We Found a Super Rare Microbe!

May 3, 2021

After over three years of searching for it, our Master of Microscopes has found a Spirostomum semivirescens!

4x12 - Bursaria: Giant Gravity-Sensing Vacuums

May 11, 2021

The big Roomba of the microcosmos is fascinating to watch as it lives its sink or swim life.

4x13 - The Diversity of Shapes in the Microcosmos

May 17, 2021

From trumpets and spirals to floral arrangements, single cell organisms take on many strange and unique shapes. But they don't look like that just for fun, their shapes can help them with movement, hunting, and even defending themselves.

4x14 - Looking at Tardigrade Sperm and Other Reproducing Swimmers

May 31, 2021

Original Title: Tardigrade Sperm and Other Reproducing Swimmers Not all hypotheses need to be good. In fact, many of them are terrible. It’s just that when you’re trying to understand the world, you might find yourself believing that there are tiny humans living inside the heads of sperm, and we're here to tell you, that's not how it works.

4x15 - Flinching Saves Lives in the Microcosmos

June 7, 2021

4x16 - Some Eggs Don't Need Sperm to Make Babies

June 14, 2021

4x17 - We Upgraded Our Microscope... Again!

June 21, 2021

4x18 - Unsolved Mysteries of the Microcosmos

June 28, 2021

Sometimes we come across microbes that we just can't learn much about, or that don't fit into a larger story. So, this week we're sharing a few of those mysterious microbes with you.

4x19 - The Beautiful, Brutal Tentacles of Hydra

July 5, 2021

4x20 - We Dipped Our Lens in Oil to See More Detail

July 13, 2021

Oil immersion is an interesting and complex microscopy tool.

4x21 - The Secret Things Living In Your Drains

July 19, 2021

4x22 - Revealing the Hidden Colors of the Microcosmos

July 26, 2021

4x23 - These Algae Curl Up Into a Ball When They Get Stressed Out

August 2, 2021

4x24 - Where Is This Anemone Really From?

August 10, 2021

4x25 - The Gruesome Tale of the Hitchhiking Parasite

August 16, 2021