Milestones in order. This is history, not a weekly activity grid.
- Animalcules seen
- Pasteur & spoilage
- Koch's anthrax
- Gram stain
- Penicillin noted
- Streptomycin
- Carl Woese's split
- First bacterial genome
Darker cells mean a higher score for this topic on that metric.
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Quick answers
Where should I start with Bacteria?
Read Identity → How they live → Body & health, then use compare rails.
Is this page advice for Bacteria?
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 Bacteria?
No — editorial 0–100 browsing aids inside this atlas only.
How do I compare Bacteria 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.
People fermented food for millennia without a theory of microbes. The microscope made the actors visible; germ theory made them politically urgent.
The twentieth century added chemistry (antibiotics) and information (sequencing). Each gift created a new problem: resistance, and too much data.
Timeline
Antonie van Leeuwenhoek describes moving specks from teeth and water.
Swan-neck flasks and pasteurisation attack spontaneous generation and save food.
A specific bacillus is tied to a specific disease — germ theory gets a method.
Hans Christian Gram gives clinics a two-bucket wall test still used daily.
Fleming sees a mould zone; Florey and Chain later make a medicine.
Soil microbe chemistry hits tuberculosis — a reminder that allies live in dirt.
rRNA trees peel Archaea away from 'bacteria' as a mixed bag.
Haemophilus influenzae is sequenced; metagenomics will soon skip culture entirely.
History of bacteria is also history of cities, war hospitals and kitchens — not only famous men with microscopes.
Keep exploring
More in Tree of microbes
Viruses
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 80Archaea
A prokaryotic domain that is not bacteria — methanogens, extremophiles and no known human pathogens.
Familiarity 35Bacteriophages
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