School gap
English textbooks added archaea late. If you only learned bacteria vs everything else, this topic is the missing third.
Darker cells mean a higher score for this topic on that metric.
Familiarity35
Medical weight22
Benefit55
Risk8
Research70
Live debate20
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Each bar is a 0-100 atlas score for this topic, not a timeline.
Both scores stay visible. Drag the slider to emphasize Benefit or Risk.
Benefit
Risk
Familiarity
35%
Milestones in order. This is history, not a weekly activity grid.
- Methane from mud
- Kluyver and methanogens
- Woese–Fox split
- Methanogen lipids
- Bacteriorhodopsin fame
- Three-domain tree
- First archaeal genome
- Lokiarchaeota
Last reviewed Sources & creditsMedia creditsMethodology
Encounter route pick
Pick one encounter or route already written on this topic and reopen it next time.
Classroom literacy — not a lab result, diagnosis or outbreak alert.
Route on this page
One encounter scale
Scale literacy. Not a lab result or a diagnosis.
Quick facts
Archaea — not BacteriaDomain
1977 — Woese and Fox, 16S rRNASplit proposed
Ether-linked isoprenoid lipidsMembrane cue
No peptidoglycanCell wall
None knownHuman pathogens
Methanogenesis is archaeal-onlySignature metabolism
Archaea are prokaryotes that are not bacteria. Ether lipids, distinct ribosomes and methanogenesis mark a domain Carl Woese peeled off the old 'bacteria' bag in 1977.
Famous species love heat, acid or salt, but the domain also fills oceans and the human gut. No archaeon is a known human pathogen.
This atlas treats archaea as a tree-of-life branch, not a synonym for 'extreme germ'. Methane, climate and eukaryote origins sit in later sections.
35FamiliarityEditorial 0–100 browsing aid within this atlas.
22Medical weightEditorial 0–100 browsing aid within this atlas.
55BenefitEditorial 0–100 browsing aid within this atlas.
8RiskEditorial 0–100 browsing aid within this atlas.
Archaea — concrete atlas depth on Tool-Lifes.
Archaea — concrete atlas depth on Tool-Lifes.
The third domain
Most English school kits still skip archaea. The local hook is the word itself — not bacteria, not ‘extremophile mascot’ only.
Methane talk
Public climate copy names cows and rice paddies. Archaea are part of that chemistry.
Public-health desks
Do not hunt archaea in home fermentation. This is a tree-of-life page.
The profile
- Familiarity35
- Medical weight22
- Benefit55
- Risk8
- Research70
- Live debate20
Risk
A prokaryotic domain that is not bacteria — methanogens, extremophiles and no known human pathogens.
Seven ways into this topic
Related on the scale
Slide across the log scale — teaching sizes, not lab measurements.
Frequently asked questions
Where should I start with Archaea?
Read Identity → How they live → Body & health, then use compare rails.
Is this page advice for Archaea?
Public-health education — not a care plan, prescription, or outbreak briefing.
What does the local lens add?
It names everyday desks for Tree of microbes before English norms look universal.
Are the scores a ranking of Archaea?
No — editorial 0–100 browsing aids inside this atlas only.
How do I compare Archaea to neighbours?
Use related cards and best-of / quiz rails after the first three chapters.
Which chapter is densest?
How they live and Body & health carry mechanisms; skim Identity first.
Can I cite these scores externally?
Treat them as atlas orientation, not certificates or forecasts.
What should I check before acting?
Primary desks for Tree of microbes: public-health desks and lab teaching frames.
Sources & research
More in Tree of microbes
Bacteria
Single-celled prokaryotes with cell walls — the oldest widespread life form, and both partners and pathogens.
Familiarity 95Viruses
Packets of DNA or RNA that are not cells — they replicate only inside living hosts.
Familiarity 96Fungi
A eukaryotic kingdom of yeasts, moulds and mushrooms — chitin walls, external digestion, partners of plants.
Familiarity 80Bacteriophages
Viruses that infect bacteria — Earth's most abundant biological entities, and a concept-level idea in medicine.
Familiarity 42Protozoa
Motile unicellular eukaryotes — a teaching grade that includes pond ciliates and a minority of serious parasites.
Familiarity 58