Theories about invisible particles causing disease go back almost 2,000 years, but it wasn't until the late 1600's that scientists finally saw microorganisms.
You've probably seen things decay before. How does the process work?
Everyone knows you should put spinach and berries in the refrigerator, but how do cooler temperatures keep most fruits and vegetables from spoiling rapidly?
If you’ve ever seen movies about World War I, you know that the soldiers in the trenches often wore bulbous gas masks that made them look like human insects. The masks were necessary to protect them from chemical weapons such as chlorine gas, a noxious substance that could almost instantly suffocate unprotected victims.
We all know we need iron to live. How else would our blood carry oxygen to our lungs? And cells need iron in order to multiply. The problem is that our cells aren’t the only ones who need iron in order to thrive. Cancer cells and microorganisms like E. Coli and staph need iron too.
This means that the ice cover contains microorganisms that date back thousands of years; recently scientists found microorganisms that froze way back when Rome was founded.
The third kingdom contains all organisms whose cells have a nucleus, including plants, animals, algae, and even fungi. So evolutionarily speaking, humans and fungi are cousins.